Investors borrow money to buy the underlying assets, which is called shorting. When it is predicted that the price of the underlying asset will rise, the short-selling operation is carried out: borrowing funds to buy the underlying asset at a low price, and after the price of the underlying asset rises, closing the position with the funds for selling the underlying asset can achieve the purpose of profit. However, if the forecast is inconsistent with the actual results, the underlying asset price will fall, and short sellers will suffer losses. Option b is correct.