问题
单项选择题
An analyst does research about profit and loss about stock and stock option transaction. An investor simultaneously purchases a stock priced at $78 and writes a call option on that stock with an exercise price of $80 selling at $6. If the price of the underlying is $85 at expiration of the option, the profit for that investor's position is closest to（）
A. $3
B. $8
C. $11
答案
参考答案：B
解析：
该交易盈亏分为股票、期权和期权费三部分。买入股票：$85-$78=$7，盈利；卖出看涨期权：$85-$80=$5，亏损；因为是卖出，期权费为$6，盈利。该交易的盈亏总和：$7-$5+$6=$8。