HELP ME PLZZ

Which sentence contains an example clue that helps the reader understand the meaning of “frugal”?

1.We were very frugal, very careful to save our money and not to spend too much.

2.Our frugal lifestyle included clipping coupons and waiting for sales before shopping.

3.Raised to be economical with the money we earned, we all went on to lead frugal lives.

4.Our friends spent whatever they earned wastefully, but we were frugal with our salaries.