Problem 15. A stock is traded for $67 per share today. In four months, the stock price will be either $74 or $64. An American put option on this stock has a strike price of $70 and time to maturity of four months. The risk-free interest rate is 3%. Then, the value of the put option is closest to (a) 3.00 dollars. (b) 4.00 dollars. (c) 6.00 dollars. (d) 2.00 dollars