the sentence is interrogative. In interrogative you have to be asking a question so the answer is interrogative.
Sentences that are exclamatory have exclamation points, so therefore it is not exclamatory.
Sentences that declarative are just regular sentences ending in a period so it is not that one.
Sentences that are imperative are orders so it's not that one.
Also imperative sentences can have exclamation points so don't mix up them.
