The stock exchange and companies raise money for their businesses. a. merchants b. brokers c. investors

The stock exchange helped merchants and companies raise money for their businesses.
It is A, because they also sell things... and technically is on the path to becoming a store, or company
It is not B, because brokers are people who bring together buyers and sellers, and act on behalf of one or the other.
It is not C, because investors buy things, and are the source of the company raising money

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