Answer:
C. On the other hand, we could just wait until my dad can give us a ride.
Explanation:
In this sentence, the introductory phrase is "on the other hand". An introductory phrase is a group of words that come before the independent clause of the sentence. Without the introductory phrase, the sentence would still be complete and make sense. To correctly set off an introductory phrase there should be a comma in between the phrase and main clause. Introductory phrases are commonly used as a way to transition from one sentence to another.
