Seven people P,Q,R,S,T,U and V are sitting in a straight line adjacent to each other, facing the north (not necessarily in the given order). R is sitting to the immediate right of U. U is sitting third to the right of P. There are only four persons sitting between P and T. Q is the immediate neighbour of V and U. Who can be the immediate neighbour of S?

A

Q

B

U

C

T

D

R