Step 1: Understanding the Question:
The question requires identifying the grammatically correct sentence involving the correlative conjunctions "neither...nor".
Step 2: Detailed Explanation:
According to the subject-verb agreement rules in English grammar, when two subjects are connected by "neither...nor", the verb must agree with the subject closest to it.
In the given sentences, the subjects are "the manager" (singular) and "the employees" (plural).
Since "the employees" is placed closest to the verb, the verb must be in the plural form ("were").
Also, the correct pair of correlative conjunctions is "neither...nor", eliminating options with "neither...or".
Therefore, the sentence "Neither the manager nor the employees were aware of the meeting." is grammatically correct.
Step 3: Final Answer:
The correct choice is (B).