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Sentence Correction: Relative Clauses - One of the + plural noun + who/which/that

The founding of Buddhism and the emergence of Zoroastrianism as a religious philosophy at roughly the same time, are one of the historical coincidences that has led philosopher Karl Jaspers to designate the period between 800-200 B.C.E the Axial Age.

Incorrect.

This answer choice is grammatically incorrect.

[[snippet]]

In addition, this answer choice contains another grammatical mistake because of incorrect punctuation: a single comma separates the subject The founding of Buddhism, etc. and the conjugated verb are.

Incorrect.

While this answer choice corrects the Relative Clause mistake in the second part of the original sentence by changing the singular verb has to the plural verb have, it introduces another grammatical mistake in the first part of the sentence by changing the plural verb are to the singular verb is. The founding of Buddhism and the emergence of Zoroastrianism is a plural subject.

What helps us identify this question as a Subject Verb Agreement question as well as identify the mistake is the following Stop Sign:

plural subject built of singular nouns connected by and

In addition, this answer choice is redundant because of the use of the words roughly around, which both mean the same thing.

Incorrect.

While this answer choice corrects the Relative Clause mistake in the original sentence by changing the singular verb has to the plural verb have, it introduces another grammatical mistake.

The singular verb is does not agree with the plural subject The founding of Buddhism and the emergence of Zoroastrianism.

Moreover, this answer choice is stylistically flawed because it is redundant and it also slightly changes the meaning of the sentence. The words by the name in the corrected sentence are redundant because they repeat the meaning of the word designate.

On the other hand, around the same time and simultaneously are not precisely equivalent in meaning. Simultaneously means "at exactly the same time", roughly the same time means "approximately at the same time".

Incorrect.

While this answer choice corrects the original Relative Clause mistake by changing the singular verb has to have (to match coincidences), this answer choice is grammatically incorrect. By changing the conjugated verb are to the non-conjugated verb being it turns the complete sentence into a fragment.

The way to find out whether a sentence is a fragment is to read until the end of the sentence and search for a conjugated verb that agrees grammatically and logically with the subject of the corrected sentence.

Well done!

This answer choice corrects the Relative Clause mistake in the original sentence by changing the singular verb has to the plural verb have.

at roughly the same time, are one of the historical coincidences that has led philosopher Karl Jaspers to designate the period between 800-200 B.C.E the Axial Age
at roughly around the same time, is one of the historical coincidences that have led philosopher Karl Jaspers to designate as the Axial Age the period between 800-200 B.C.E
at roughly the same time are one of the historical coincidences that have led philosopher Karl Jaspers to designate the period between 800-200 B.C.E as the Axial Age
simultaneously is one of the historical coincidences that have led philosopher Karl Jaspers to designate the period between 800-200 B.C.E by the name the Axial Age
at around the same time being one of the historical coincidences that have led to the designation of the period between 800-200 B.C.E as the Axial Age by philosopher Karl Jaspers