Explanation:

Correct Answer is (d).If the committee members are unanimous regarding a decision, in that case, the committee is considered as a singular collective noun and a singular verb is used in the context. On the other hand, if a committee has members differing in their views regarding something, the plural form of the verb is used in that case.
In the given context, the committee members are differing in their opinions and therefore plural form of verb should be used. As the tense is correct in the sentence, the correct verb would have been ‘were’.
The correct sentence would have been: The committee were divided in their opinion regarding the new regulations for the National Health Protection Scheme.
This makes option D the correct choice among the given options.