What Is the OH^- Concentration of an Aqueous Solution with a PH

Multiple Choice

What is the OH^- concentration of an aqueous solution with a pH of 2.77? (K_w = 1.01 $\times$ 10^-14)

A) 5.9 $\times$ 10^-12 M
B) 1.7 $\times$ 10^-3 M
C) 5.2 $\times$ 10^-2 M
D) 1.1 $\times$ 10¹ M
E) 5.9 $\times$ 10² M