Answer:
The correct answer would be option B, A bank approves mortgage for a customer.
Step-by-step explanation:
Injecting money into the economy means increasing money supply in the economy. It means more money is in the circulation. So when a bank approves a mortgage for a customer, it means bank is releasing money which will be in circulation and becomes a part of the economy. Mortgage is basically the loan or money which a bank or financial institution lends to a person or company on an agreed upon interest rate in exchange of their property with the condition that the bank will sell the property to get its money back if the borrower fails to return the loaned money. So the best example of how a bank can inject money into the economy is to approve the mortgage for a customer.