Option A. The combined sentence uses a compound verb.
Explanation:
In grammar, a compound verb is known as a verb that is made up using multiple words, more spceifically by joining a verb with a preposition or an adverb. In the case of the combined sentence "The would travel to the southern tip of South America and fly from there to the American antarctic outpost" there are two compound verbs being used, one being "travel to" and the other being "fly from".
