Correct Answer: To make a very important decision

Solution : The correct choice is the third option

Explanation : The idiom "be at a crossroads" conveys the idea of standing at a pivotal moment in life where a significant decision or choice must be made. In this context, the correct meaning is to make a very important decision, as it aligns with the idiom's essence of facing a momentous choice.

Therefore, the correct meaning of the idiom is to make a very important decision.