An argument.
An opinion is never correct nor incorrect they are all valid in their own right. So that eliminates b. It’s true that it can’t be proven to true or false however, some opinions have no evidence so they have no warrant to be proven or disproven. An argument however, is how you argue for what you believe in, you provide examples, to prove you’re right. To prove your opinion so I believe that D is the best option here.
