What Is the [OH¯] for a Solution at 25 $\degree$ C That Has PH = 4

Multiple Choice

What is the [OH¯] for a solution at 25 $\degree$ C that has pH = 4.29?

A) 1.4 *10¯² M
B) 5.l * 10¯⁵ M
C) 1.9 * 10¯¹⁰ M
D) 7.3 * 10¯¹³ M
E) 9.71 M