Each question has four sentences. One or more sentences may be incorrect in grammar or meaning. Identify the sentence(s) that are incorrect.
A. Neither the senior research director nor his team members was present at the conference to present the breakthrough findings on cellular regeneration.
B. The ministry official asked the regional directors how did they intend to allocate the central education funds among underdeveloped rural districts.
C. If the urban municipal authority fixes the sewage pipelines before monsoon, flooding in low-lying residential sectors will be reduced drastically.
D. Historical archives demonstrate that ancient trading routes fostered cultural exchange between Asian and European civilizations over centuries.

• Sentence A is INCORRECT: When subjects are joined by "Neither... nor", the verb agrees with the subject closest to it. Here, "his team members" is plural, so the verb must be plural (were). o Rule: Subject-Verb agreement with Neither... nor (verb agrees with the nearest subject). o Correction: "...nor his team members were present..." • Sentence B is INCORRECT: In indirect speech / indirect questions, the standard word order is Subject + Verb. Auxiliary verbs like "did" should not be placed before the subject. o Rule: Indirect interrogative sentences use assertive order (Question word + Subject + Verb). o Correction: "...asked the regional directors how they intended to allocate..." • Sentence C is CORRECT: Standard First Conditional structure (If + simple present ..., simple future ...). • Sentence D is CORRECT: Grammatically complete with correct subject-verb agreement (archives demonstrate).