The common stock of Trynor's, Inc. is currently priced at $37.90 a share. One year from now, the stock price is expected to be either $38 or $43 a share. The risk-free rate of return is 3.5 percent. What is the current value of one call option on this stock if the exercise price is $40?
a. $0.64
b. $0.71
c. $0.77
d. $0.82
e. $0.91