What is the verb phrase in this sentence? Must Tyler bang on the drums? A. must bang B. Tyler bang C. bang drums D. must Tyler

Actually, some of the definitions of verb phrase would say that "must bang on the drums" is the VP.

But in the narrow sense, and if we have to choose, the right answer is A: must bang (it has only verbs in it). In any case we can exclude B and D as Tyler is the subject and is not included. So we could consider A and C and in fact both are (kind of) VP, but C is wrong because it's incomplete, in order to be a VP, it'd need to be "bang on the drums".

The verb phrase in the sentence above is A. Must bang. It contains a verb, with direct and indirect object. And it is not a subject.