I really need help with these 3 questions.

The opportunity cost of capital for a safe investment is: Select one: a. the interest rate that the firm receives on its checking account. b. the expected rate of retum on the stock market. c. the rate of retum on U.S. Treasury notes. d. the interest rate that the firm pays on a loan from a bank or insurance company. The cost of capital: Select one: a. is an opportunity cost determined by the risk-free rate of return. b. is the interest rate that the firm pays on a loan from a bank or insurance company. c. for risky investments is normally higher than the firm's borrowing rate. O d. is the expected rate of retum on capital investment. A company can pay for its expansion in all the following ways except: Select one: a. By using the earnings generated from its sale of obsolete equipment. O b. By persuading the director's mother to make a personal loan to the company. c. By convincing its suppliers to give the company an extra month of credit for its purchases. O d. By selling stock certificates for a new subsidiary