单选题 An options investor sells one stock put option with the following characteristics:
Type of option: put option on stock
Underlying asset: 100 shares of Bank of America Stock
Exercise price : $55 per share
Premium : $2.44 per share
Expiration date : October
By taking a SHORT position in this put option, the investor has

A、 obligated herself to sell 100 shares of Bank of America stock and receive $5500 during the specified time period (expiration date in October).
B、 purchased the right to decide whether to sell 100 shares of Bank of America stock and receive $5500 during the specified time period (expiration date in October).
C、 obligated herself to purchase 100 shares of Bank of America stock and pay $5500 during the specified time period (expiration date in October).

【正确答案】 C

【答案解析】The seller of a put option is obligated to buy the underlying instrument. The exercise price of this option is: 100 × 55 = 5500.