Given the above data, the value of a call option with a strike price of 45 is:

The stock's price is $50. -- After three months, it either goes up by the factor U = 1.16038286 or it goes down by the factor D = 0.85963276. Options mature after T = 0.25 years. The continuously compounded risk-free interest rater is 4 percent per year. Given the above data, the value of a call option with a strike price of $45 is