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Solutions
The error lies in the second part of the sentence.
"Boom" can either be used as a noun, a verb or an adjective. The given segment already has a noun i.e. "business" and the word "boom" here describes the business (works as an adjective). Hence, it should be replaced by its adjective form i.e. "booming" which means having a period of great prosperity or rapid economic growth. Thus, option B is the right response.