Correct Answer: To do something without worrying about the risk

Solution : The correct answer is the third option.

The most appropriate understanding of the idiom "to throw caution to the wind" is to undertake an action without considering the potential risks involved.

The idiom "to throw caution to the wind" means to act without considering the potential risks or consequences. When someone throws caution to the wind, he is taking a bold and often spontaneous action, disregarding the usual prudence or caution associated with the situation.

Therefore, the correct answer is," To do something without worrying about the risk".