A European call option for a stock has an exercise price of $70, and expires one year from today. Suppose that the stock price has an equal probability of being valued at $60, $70, $75, $83, and $89 dollars per share, one year from now. What is the current present value of the option, given an effective annual rate of 10%? Select one: O a. $8.2 O b. $7.5 O c. $7 d. $6.3 o e. $6.7