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17.The current price of a non-dividend paying stock is $50. Use a two-step tree to value an American put option on the stock with a strike price of $48 that expires in 12 months. Each step is 6 months, the risk free rate is 5% per annum, and the volatility is 20%.  Which of the following is the option price?
A.$1.95
B.$2.00
C.$2.05
D.$2.10