We drove without a break the entire way to the beach. what word does the prepositional phrase "without a break" modify ? a. we b. drove c. break d. beach

B. Drove

You ask the question of a prepositional phrase "How did we drive?" And that leads you to see that you drove without a break. 

A prepositional phrase is a phrase the consists of a preposition and its objects, which are used to modify something. In the given sentence, the prepositional phrase "without a break" modifies the word "drove". It describes how the subject drove. The preposition used in this phrase is "without".