A 85 $\times$ 10^-3 M Solution of a Weak Acid Is 4

Multiple Choice

A 8.5 $\times$ 10^-3 M solution of a weak acid is 4.6% dissociated at 25°C.In a 8.5 $\times$ 10^-4 M solution,the percentage of dissociation would be

A) the same
B) > 4.6%
C) < 4.6%
D) zero
E) need to know the K_a of the acid to answer this