JEE Math Practice Question

In a $$\Delta PQR,{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} $$ If $$3{\mkern 1mu} \sin {\mkern 1mu} P + 4{\mkern 1mu} \cos {\mkern 1mu} Q = 6$$ and $$4\sin Q + 3\cos P = 1,$$ then the angle R is equal to :

1. A.$${{5\pi } \over 6}$$
2. B.$${{\pi } \over 6}$$
3. C.$${{\pi } \over 4}$$
4. D.$${{3\pi } \over 4}$$