What Is the [H₃O⁺] in a Solution That Consists of 1.2

Multiple Choice

What is the [H₃O⁺] in a solution that consists of 1.2 M HClO and 2.3 M NaClO? K_a = 3.5 *10¯⁸

A) 7.8 * 10¯⁹ M
B) 1.8 * 10¯⁸ M
C) 6.7 * 10¯⁸ M
D) 1.6 *10¯⁷ M
E) None of these choices is correct.