Read each sentence carefully to find out whether there

Solution

This question tests subject–verb agreement, particularly with collective expressions such as “a majority of.” When the phrase refers to individual members of a group (people counted separately), the verb must be plural. In this sentence, “respondents” clearly refers to multiple individuals, so the verb must agree in the plural form. However, “believes” is singular and incorrectly matches “majority” instead of the plural noun “respondents.” Therefore, the correct form should be “believe.” Since the error occurs in part (b), that option is correct.