The correct answer is A.
There are three types of claims in general :
- Claims of fact. They assert that a condition exists or will exist and they rely on factual information for support.
- Claims of value. They make a judgement and express approval or disapproval, attempting to prove that some belief, action or condition is right or wrong.
- Claims of policy. They argue that certain policies should exist. The words should and must are almost always implied in them.
'It is morally wrong not to vote' is a claim of value, as it contains a judgment in form of disapproval.