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Sentence Correction: Subject Verb Agreement - X of Y Subject

Although the organizers of the famous English rock festival Glass Town Berry have provided appropriate camping arrangements for festival-goers, the number of attendants who chose to sleep in a tent over accommodation in nearby towns have amounted to a mere sum of 30,000, a meager 10% of the total number of tickets sold.

Very good!

This answer choice corrects both original mistakes without creating any new ones or altering the meaning of the original sentence.

Although this answer choice corrects the original redundancy and eliminates the X of Y subject Stop Sign by changing the number of attendants to attendants, it is still grammatically incorrect. The now plural subject attendants does not agree with the singular verb has

What helps us identify this mistake is the following Stop Sign:

A long complex subject / A long distance between the subject and the verb

Although this answer choice corrects the original Subject Verb Agreement mistake, it repeats the other original mistake: using both amounted to and a sum is redundant.

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

amount to a sum

Although this answer choice corrects both original mistakes, it is illogical. By adding the commas on both sides of the relative clause who chose to sleep in a tent over accommodation in nearby towns, this answer choice turns the defining relative clause into a non-defining relative clause.

The original sentence with the defining relative clause focused on the number of attendants who slept in tents, which was only 10% of the total number of attendants.

However, in this answer choice the relative clause is non-defining. Thus, this focus is lost and the sentence seems to refer to the number of attendants while noting that attendants slept in tents. Clearly, the number of attendants cannot be only 10% of the (very same) total number of attendants.

This answer choice is grammatically incorrect. The singular subject the number of attendants does not agree with the plural verb have

The following Stop Signs help us identify this question as a Subject Verb Agreement question as well as identify this mistake:

- A subject in the form of X of Y

- A long complex subject / A long distance between the subject and the verb

Furthermore, this answer choice is stylistically flawed. Using both amounted to and a sum is redundant.

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

amount to a sum

the number of attendants who chose to sleep in a tent over accomodation in nearby towns have amounted to a mere sum of 30,000
the number of attendants, who chose to sleep in a tent over accommodation in nearby towns, has amounted to merely 30,000
the number of attendants who chose to sleep in a tent over accommodation in nearby towns has amounted to a mere sum of 30,000
attendants who chose to sleep in a tent over accommodation in nearby towns has amounted to merely 30,000
the number of attendants who chose to sleep in a tent over accommodation in nearby towns has amounted to a mere 30,000