Question

they returned to the hotel to change.
subject
predicate nominative
adverb

Explanation:

To determine the correct label for "They" in the sentence "They returned to the hotel to change", we analyze the sentence structure. The subject of a sentence is the person, place, thing, or idea that performs the action (or about which something is stated). "They" is the pronoun that acts as the doer of the action "returned", so it functions as the subject. A predicate nominative renames the subject and follows a linking verb (which is not the case here as "returned" is an action verb). An adverb modifies a verb, adjective, or other adverb, and "They" does not serve that purpose.

Answer:

subject