Answer:
Opinion
Step-by-step explanation:
First of all saying that the voting age should be raised to 21 is not a fact. By definition a fact is a thing known or proved to be true. But the voting age should be raised to 21 is not a fact. This means that it is an opinion. Furthermore this is an opinion because an opinion is a view or judgement about something and in this case you are having a judgement about the voting age raised to 21. Therefore this sentence is an opinion