Option d) has an error. 'Robust functional connectivity' is a singular subject, and it must be followed by a singular verb according to subject-verb agreement. 'Promote' is a plural verb and must be replaced by 'promotes' to rectify the error. Hence, d) 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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