Hello There!
Let me first define each one of these.
Claim of definition is an explanation of a concept or presented argument.
Claim of policy is an argument which presents a problem and a solution.
Claim of fact is a statement which considers fact as a claim.
Claim of value is an argument which states which of the two things are better.
"Election day should be a national holiday" is a claim of policy because we are discussing a policy which searches a solution for the presented argument. The correct answer is C.