Someone me with this question
as the enemies approached our camp, the watchmen thwarted an attack by firing warning shots into the air.
prepared
prevented
caused
wanted

Prevented

Explanation:

To "thwart" means to successfully oppose something. It can also mean to frustrate or prevent a plan from taking place. In this sentence, we learn that enemies were approaching to the camp, and that the watchmen reacted to this. We learn that they "thwarted" the attack, which means that they prevented it.

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