Part A has an error.
According to the subject-verb agreement, the verb 'does' is used with only singular subjects. Since the subject 'we' is plural in nature, 'does' should be replaced with 'do' to rectify the given sentence.
Hence, option (b) 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]
Study Notes
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