In a Chemical Reaction at Equilibrium,the Concentration of R (The

In a chemical reaction at equilibrium,the concentration of R (the reactant) is 3.0 mol/L and the concentration of P (the product) is 0.9 mol/L.At 25°C,what would be the K_eq?

A) 1.5
B) 0.3
C) 1.0
D) 3.0
E) 37.5