Final answer:
The adverb in the sentence provided is 'always,' which describes the frequency of the action of listening to the playlist during the holidays. The correct option is 'always'. Adverbs modify verbs, adjectives, or other adverbs, and in this case, it modifies 'listen'.
Step-by-step explanation:
The adverb in the sentence "I always listen to this playlist during the holidays" is always. Adverbs are words that modify verbs, adjectives, or other adverbs to provide more information about how, when, where, to what extent, or under what conditions something happens. In this case, always is providing information about the frequency with which the action of listening to the playlist occurs.
Adverbs like always can be crucial for expressing habitual actions, which is particularly relevant during times of year marked by traditions, such as the holiday season. By saying "I always listen to this playlist during the holidays," the speaker is expressing that listening to the playlist is a consistent part of their holiday routine.
The correct option from the provided choices is "always."