What Is the [H₂AsO₄^-] for a Solution Labeled 0

Multiple Choice

What is the [H₂AsO₄^-] for a solution labeled 0.10 M arsenic acid (H₃AsO₄) ? [Ka1 = 6 × 10^-3, Ka2 = 1 × 10^-7, Ka3 = 3 × 10^-12]

A) 1 × 10^-7
B) 6 × 10^-3
C) 0.02
D) 0.08
E) 6 × 10^-10