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 once varied greatly in price.
cell phones were once very expensive.
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Explanation:

The idiom "cost an arm and a leg" means something is extremely expensive. The sentence contrasts past (when cell phones cost an arm and a leg) with present (most can afford them). The first option talks about price variation, which the idiom doesn't imply. The second option matches the meaning of the idiom.

Answer:

Cell phones were once very expensive.