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

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

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

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

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

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

Explanation:

The word frugal means economical in practice, not to waste anything and to be prudent with spendings and savings in order to not waste anything including material and money matters. The first sentence is very self-explanatory therefore is the correct one.

the two answers are

get thee back into the tempest and the night's plutonian shore

on the pallid bust of pallas just above my chamber door

- "when these words are put together to convey a meaning it is known as a sentence. a sentence is a group of words that makes complete sense. placing of words in a sentence is very important. the second sentence is a question."