Answer:
The error with subject-verb agreement is highlighted below:
Dakota's favorite hiking trail wind from the base of Mt. Diablo up to the summit, which offers breathtaking views of the surrounding area.
The correct verb conjugation would be:
Dakota's favorite hiking trail winds from the base of Mt. Diablo up to the summit, which offers breathtaking views of the surrounding area.
Step-by-step explanation:
The verb "wind" used in the sentence has "trail" as its subject. Since "trail" is singular and the verb is in the present tense, "wind" should be conjugated for the third person singular. As we know, in the present tense, the third person singular uses verbs with the endings -s, -es, or -ies. For example: wind - winds; watch - watches; study - studies.
With that in mind, we can correct the sentence:
Dakota's favorite hiking trail winds from the base of Mt. Diablo up to the summit, which offers breathtaking views of the surrounding area.