Seven students, Q, R, S, T, W, X and Y, are sitting in a straight line facing north. Only W
sits to the right of R. Only three people sit to the left of S. Only three people sit between
R and Y. Q sits at some place to the left of T but at some place to the right of X. How
many people sit to the left of X?
AThree
BOne
CTwo
DNone