Storm's feed

okay so i suck at chemistry does anyone understand this question
In an aqueous acid solution, the [H+] ion is found to be 1 x 10^-2 mole per liter. What is the [OH-] ion is moles per liter? A. 1 x 10^-14 B. 1 x 10^-12 C. 1 x 10^-7 D. 1 x 10^-2