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Sentence Correction: Subject Verb Agreement - A Complex Subject/Long Distance between Subject and Verb

Rudolf Steiner, who is known primarily for founding anthroposophy, were born on February 25, 1861.

You're right!

This answer choice corrects the original Subject Verb Agreement mistake by changing the plural verb were to the singular verb was to match the singular subject Rudolf Steiner

Incorrect.

This answer choice is grammatically incorrect: the singular subject Rudolf Steiner does not agree with the plural verb were.

[[snippet]]

Incorrect.

This answer choice repeats the original Subject Verb Agreement mistake: the singular subject Rudolf Steiner does not agree with the plural verb were.

[[snippet]]

In addition, this answer choice changes the singular verb is to the plural form are, thus creating yet another Subject Verb disagreement.

Incorrect.

While this answer choice corrects the original Subject Verb Agreement mistake, it changes the singular verb is to the plural form are, thus creating another Subject Verb disagreement.

Incorrect.

This answer choice repeats the original Subject Verb Agreement mistake: the singular subject Rudolf Steiner does not agree with the plural verb were.

[[snippet]]

Note that the change of wording, from known primarily to mainly famous does not change the meaning of the original sentence. Mainly and primarily have the same meaning, as do famous and known.

is known primarily for founding anthroposophy, were
are known primarily for founding anthroposophy, were
are known primarily for founding anthroposophy, was
is known primarily for founding anthroposophy, was
is mainly famous for founding anthroposophy, were