问题
单项选择题
Prior to expiration, an American put option on a stock:()
A. is bounded by S-X/(1 +RFR)T
B. will sell for its intrinsic value.
C. will never sell for less than its intrinsic value.
答案
参考答案：C
解析：
At any time t, an American put will never sell below intrinsic value, but may sell for more than that. The lower bound is Max [ 0, X -St ].