If E and F are events .Such that $P(E)=\large\frac{1}{4}$$,P(F)=\large\frac{1}{2}$ and P(E and F)=$\large\frac{1}{8}$.Find P( E or F)

Question

$\begin{array}{1 1}(A)\;\large\frac{5}{8}\\(B)\;\large\frac{7}{8}\\(C)\;\large\frac{3}{8}\\(D)\;\large\frac{1}{8}\end{array}$