Part A has an error. There are some nouns which are used only in the plural form. For example: jeans, scissors, pants, spectacles, outskirts, etc. 'Trousers' is one such word and the verb has to agree with the subject in the sentence. So, the correct form of the given sentence would be: "His trousers were slightly too short and tight as well around his waist." Hence, (a) is the correct answer.
Note:-
Subject-Verb Agreement: Matching up singular or plural subjects with singular or plural forms of a verb is part of the process called agreement. This can be understood better by the examples given: - "She likes cooking." [singular subject and verb] -- "They like to cook vegetables." [plural subject and verb]
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