The Formula for Pricing Options by Repeated Application of Risk-Neutral $\pi$

The formula for pricing options by repeated application of risk-neutral pricing is given by which of the following formulas,where $\pi$ = [(1 + R) - D]/(U - D) ;U and D are the up and down factors,respectively; (1 + R) is the dollar return;option_U is the option price at the next node in the up state;and option_D is the option price at the next node in the down state?

A) option price= [ $\pi$ * option _U + (1 - $\pi$ ) * option_D] * (1 + R)
B) option price = [ $\pi$ * option _U + (1 - $\pi$ ) * option_D] / R
C) option price = [ $\pi$ * option _U +(1 - $\pi$ ) *option_D] / (1 +R)
D) option price = [ $\pi$ ² * option _U + (1 - $\pi$ ) ²*option_D] * (1 +R)
E) None of these answers are correct.