Answer:
C) a higher real interest rate reduces a borrowing firm's profit and hence its willingness to borrow.
Step-by-step explanation:
Companies borrow money to leverage their projects, investments or regular business activities. When they borrow money, they do it to earn more money themselves, not just to make a bank or a bondholder earn money. Since the company must repay its loans, the profit it makes using the loans must offset the money it must pay back in interest.
E.g. I borrow $100 for my business and the bank charges me $7 in interest per year, so I must be able to use that money to increase my profit by more than $7 a year.