The Value of K_eq for the Following Reaction Is 0

The value of K_eq for the following reaction is 0.50: A (g) + 2B (g) C (g) + 4D (g)
The value of K_eq at the same temperature for the reaction below is ________. A (g) + B (g) C (g) + 2D (g)

A) 7.1 × 10^-1
B) 2.5 × 10^-1
C) 0.25
D) 1.0
E) 0.50