magnitude of the vertical reaction force

Question

A simply supported beam of length L is subjected to a varying distributed load sin(3$\Pi$x/L)$Nm^-1$ ,
where the distance x is measured from the left support. The magnitude of the vertical reaction
force in N at the let support is

(a) zero                                           (b) L/3$\pi$
(c) L/$\pi$                                             (d) 2L/$\pi$