Question

what does the idiom in this text suggest? cell phones once cost an arm and a leg, but today the majority of people can afford them. cell phones were once popular items to trade. cell phones were once very expensive.

Explanation:

The idiom "cost an arm and a leg" means something is very expensive. In the sentence, it's used to describe cell phones in the past, contrasting with today when most people can afford them. So the idiom suggests cell phones were once very expensive. The first option about being popular to trade is not related to the meaning of the idiom.

Answer:

Cell phones were once very expensive.