The Reaction: H₂(g)+ I₂(g) 2HI(g)

The reaction: H₂(g) + I₂(g) 2HI(g)
Has K_p = 45.9 at 763 K.A particular equilibrium mixture at that temperature contains gaseous HI at a partial pressure of 4.00 atm and hydrogen gas at a partial pressure of 0.213 atm.What is the partial pressure of I₂?

A) 0.213 atm
B) 0.409 atm
C) 1.64 atm
D) 10.9 atm
E) 75.1 atm