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
的斜面向上做匀加速直线运动，则弹簧秤读数为：
