Answer:
Roland
Step-by-step explanation:
Subject in a sentence is the one that performs the action verb in the sentence.
In the sentence:
Roland jumped on the trampoline, much to everyone's surprise.
Roland is performing the action verb (jumped).
So in the above sentence
Roland is a subject noun.
jumped is an action verb.
trampoline is not a subject but an object because the action verb (jumped) is being performed on it.