Why isn’t asbestos used much in the U. S. today?
a. The government banned the use of most asbestos products.
b. Inflation has made it too expensive for most people.
c. A better form of insulation has been discovered.
d. The original manufacturer went out of business.

In the 1970s, asbestos very famously was found to be a carcinogen. And it is not completely banned yet so I would have to say C. since there was many proofs of it being toxic and better insulation was formed.

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i think the answer is b.