Consider an option on a non-dividend paying stock where the stock price is $30, the strike price is $29, the continuously compounded risk-free rate of return is 5% per year, the continuously compounded standard deviation of its return is 25% per year and the time to maturity is 4 months. If the Black-Scholes price of a European call on this option is C, then the price of an American call on this stock is

A) none of these other answers are correct

B) slightly less than C but difficult to determine without an American option pricing model

C) slightly greater than C but difficult to determine without an American option pricing model

D) equal to C