Can you Identify the correct equilibrium constant, Keg, expression

Question

2H2(g)+02(g)<->2H20(l)?
a)Keg=1/(2(H2)(02))
b)Keg=(H20)2/((H2)2(02))
c)Keg=1/(H2)2(02))
d)Keg=(H2)2(02)

Answer 1

A is wrong