与四环素同服可生成配伍化合物，影响四环素吸收的是（）

A．新霉素

B．活性炭

C．抗贫血药

D．多潘立酮

E．氨茶碱

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).