Six people A, B, C, R, S and T are sitting around a circular table facing the centre (but not necessarily in the same order). Only three people sit between A and S when counted from the right of S. Only two people sit between A and B. R sits to the immediate right of C. How many people sit between T and A when counted from the left of A?

Six people: A, B, C, R, S, T sitting around a circular table, all facing centre.
Only three people sit between A and S when counted from the right of S.
Only two people sit between A and B.
R sits to the immediate right of C.

According to the given information, Seating arrangements will be:

As per the arrangements, there are four people (R C , B and S) sit between T and A when counted from the left of A.

Thus, the correct option is (a) Four.