Correct Answer: you might break

Solution : The third option is correct.

Explanation : The underlined part of the sentence includes the modal auxiliary might , which is followed by the base form of the verb. The use of broken in the original sentence is incorrect, as it is not the appropriate form after the modal might . The base form of the verb break is used to indicate a potential action without specifying the time or tense.

Therefore, the correct sentence would be: "Don't try to force the window open, or you might break it ."