Which sentence contains an example cue, a type of context clue to help the reader understand the meaning of "frugal”?

We were very frugal, very careful to save our money and not to spend too much.
Her frugal lifestyle of clipping coupons and waiting for sales helped her to live better with a minimum wage job.
Living a frugal life in childhood has helped me become more economical with shopping decisions as an adult.
Our friends spent whatever they earned wastefully, but we were frugal with our salaries.