Find the radian measures corresponding to the following degree measures :-$-47^{\large\circ}30'$

Question

$\begin{array}{1 1}(A)\;\large\frac{-19\pi}{72}\normalsize radians&(B)\;\large\frac{19\pi}{72}\normalsize radians\\(C)\;\large\frac{19}{72}\normalsize radians&(D)\;\large\frac{19\pi}{36}\normalsize radians\end{array}$