Which of the following will increase an investor's risk?

A. Purchasing a T-bill from the sale of common stock.
B. Buying a 'BB' rated bond with cash from a bank savings account.
C. Buying a bank's certificate of deposit with the proceeds from the sale of Conseco's junk bonds.
D. Purchasing a bank CD from the sale of soy bean futures.
E. None of the responses will increase an investor's risk.