A simply supported beam of length L is subjected to a varying distributed load $$\sin \left(\frac{\pi x}{L}\right) N/m$$, where distance x is measured from the left support. The magnitude of the vertical reaction in N at the left support is

A

$$\frac{3L}{\pi}$$

B

$$\frac{2L}{\pi}$$

C

$$\frac{L}{2 \pi}$$

D

$$\frac{L}{\pi}$$