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Choose the option that best corrects the grammatical or logical error in the underlined fragment.

Neither the company's overly ambitious product roadmap nor the extensive market research reports, despite their voluminous nature, has adequately addressed the core concerns of the regulatory body regarding consumer safety.

A. (No change)
B. have adequately addressed
C. adequately addresses
D. is adequately addressing

1. Identification of Error: Subject-Verb Agreement in a 'Neither...nor...' construction.
2. Grammatical Rule: In a 'Neither...nor...' construction, when the subjects are of different numbers (singular and plural), the verb agrees with the subject closest to it. Here, 'reports' (plural) is closer to the verb than 'roadmap' (singular).
3. Option Elimination:
A. Incorrect — 'has adequately addressed' is singular, but the closest subject 'reports' is plural.
B. Correct — 'have adequately addressed' is plural and correctly agrees with 'reports'.
C. Incorrect — 'adequately addresses' is singular and changes the tense/aspect incorrectly.
D. Incorrect — 'is adequately addressing' is singular and alters the tense/aspect unnecessarily.