throw caution to the winds

Options

A. to be fearful
B. to warn others not to travel
C. to behave recklessly
D. to behave with care and caution

Answer

C

Explanation

throw caution to the winds: to do something without worrying about the risk, to behave recklessly. Look at the sentence: I threw caution to the wind and bought the most expensive one. Here, to behave recklessly is the right option.