In a circular seating arrangement, A is sitting to the immediate right of B, and C is sitting to the immediate left of D. If E is sitting opposite A, who is sitting to the immediate left of C?
A committee of four members is to be formed from the following people: P, Q, R, S, and T. P and Q cannot be in the committee together. R must be included if S is included. T can be included only if R is included. Which of the following groups is a valid committee?