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Sentence Correction: Subject Verb Agreement - X of Y Subject

A bus of refugees, while desperately attempting to flee from the Sri Lankan war zone to the town of Vuvuniya, were violently attacked by Tamil Tiger rebels, increasing the toll of civilian lives taken during the war.

This answer choice repeats the original Subject Verb Agreement error.

A bus of refugees is an X of Y subject. In such cases, the verb should agree with X (bus), which is singular. Therefore, the plural verb were should not be used. 

[[snippet]]

Very well done!

This answer choice corrects the original Subject Verb Agreement error by matching the singular subject (bus of refugees) with a singular verb (was) while correctly using adverbs (desperately, violently) to describe verbs (attempting, attacked).

Incorrect.

Although this answer choice corrects the original Subject Verb Agreement error by matching the singular subject bus with the singular verb was, it incorrectly uses an adjective (violent) to describe a verb (attacked). An adverb should be used to describe a verb.

Incorrect.

Although this answer choice corrects the original Subject Verb Agreement error by matching the singular subject bus with the singular verb was, it incorrectly uses an adjective (desperate) to describe a verb (attempting). An adverb should be used to describe a verb.

Incorrect.

This answer choice creates a Subject Verb Agreement error.

A bus of refugees is an X of Y subject. In such cases, the verb should agree with X (bus), which is singular. Therefore, the plural verb were should not be used. 

[[snippet]]
A bus of refugees, while desperately attempting to flee from the Sri Lankan war zone to the town of Vuvuniya, were violently attacked
A bus of refugees, while attempting desperate to flee from the Sri Lankan war zone to the town of Vuvuniya, was violently assaulted
A bus of refugees, desperately attempting to flee from the Sri Lankan war zone to the town of Vuvuniya, was attacked violent
A bus of refugees, attempting desperately to flee to the town of Vuvuniya from the Sri Lankan war zone, was attacked violently
While desperately attempting to flee from the Sri Lankan war zone to the town of Vuvuniya, a bus of refugees were violently attacked