Seven people, P, Q, R, S, T, U and V are sitting in a straight row, facing north. Only four people sit to the right of P. Only two people sit between P and S. Q is sitting third to the right of V. T is sitting second to the right of V. U is sitting third to the left of T. Who is sitting at the extreme right end of the row?

A

R

B

T

C

P

D

S