Read the following sentence from the article. Air conditioning spread to nearly 100 million American homes — more than 87 percent of all households, according to a federal organization.

HOW does this detail develop the article’s central idea?

A

by showing how quickly air conditioning was made available

B

by highlighting the impact of improvements to air conditioning

C

by describing the popularity of air conditioning in hot-weather states

D

by suggesting federal regulations made air conditioning possible

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