Does anyone know how to answer this question?

Given the maturity of an American put option 2 years, riskfree rate 10%, volatility of the stock 40%, current spot price of stock $50, strike price $50, what is the one-step risk neutral probability that stock price goes up considering a three-step binomial tree?

A) 0.201

B) 0.452

C) 0.910

D) 0.547