ACT Problem 32

$$\begin{array}{lcl} 32.\;The\;angle\;\theta\;lies\;in\;the\;second\\ quadrant\;and\;\sin \theta = \frac{4}{5}.\;What\;is\;the\\ value\;of\;\cos \theta ?\\ \\ (F)\; \frac{1}{5}\\ \\ (G)\; \frac{3}{5}\\ \\ (H)\; -\frac{3}{5}\\ \\ (J)\; -\frac{1}{5}\\ \\ (K)\; \frac{2}{5}\\ \end{array}$$