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