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).