What Would the Concentration of OH^- Be If the Concentration

Multiple Choice

What would the concentration of OH^- be if the concentration of H₃O⁺ was 1 × 10^-8M? [H₃O⁺] × [OH^-] = K_w = 1 × 10^-14

A) 1 × 10^-14
B) 1 × 10^-6
C) 1 × 10⁸
D) 1 × 10⁶
E) 1 × 10^-8