Answer: B, D

The applicable situations for hedging by buying Treasury bond futures are: (1) Planning to buy bonds and worrying that interest rates will fall, causing bond prices to rise; (2) ) Borrowers who calculate interest at a fixed interest rate are worried that interest rates will fall, which will lead to a relative increase in capital costs; (3) Lenders of funds are worried that interest rates will fall, which will lead to a decline in loan interest rates and income.