The success of recent class-action lawsuits filed against three large mail order book clubs have led to a revision in the contractual language used by similar businesses.
A. have led to a revision in the contractual language used by similar businesses
B. has led to a revision in the contractual language used by similar businesses
C. has led them to a revision in the contractual language used by similar businesses
D. leads them to a revision used in the contractual language by similar businesses
E. have led to the revising of the contractual language used by similar businesses
This question is based on Subject-Verb agreement.
The underlined portion begins with a verb, the subject of which is “The success”. Since the subject is singular, the verb must also be singular.
Options A and E contain the plural form ‘have’. Since the verb doesn’t agree with the subject, Options A and E can be eliminated.
The adjective ‘recent’ indicates that the action has been completed in the recent past. The present perfect tense is more appropriate to convey this idea. Since Option D contains the simple present form of the verb - leads – Option D can be eliminated.
Option C contains an ambiguous pronoun. It is not clear to whom the pronoun “them” refers. So, Option C can be eliminated.
Option B maintains subject-verb agreement and contains the appropriate tense form.
Therefore, B is the best of all the options.