please answer just D please

1. Binomial tree practice. Consider a risky asset that has a current value of $20 million. The return volatility for the asset is 35%. (a) Construct a one-year binomial tree for the risky asset with three steps (At = ). (b) Construct a one-year binomial tree for the risky asset with four steps (At 1). (c) Construct a two-year binomial tree for the risky asset with four steps per year (At = 1). (d) Construct a one-year binomial tree for the risky asset with 12 steps (At = ia)