A, B, C, D, E sit in a row. A is two seats left of C. B is to the immediate right of A. D is at the rightmost end. Who sits in the middle (seat 3 of 5)?

5 seats: _ _ _ _ _ (positions 1-5). D in position 5. A is two left of C → if A=1, C=3; if A=2, C=4; if A=3, C=5 but D=5 (conflict). So A=1,C=3 or A=2,C=4. B immediately right of A → if A=1, B=2; if A=2, B=3. Case 1: A=1, B=2, C=3, D=5, E=4. Middle (seat 3) = C. Case 2: A=2, B=3, C=4, D=5, E=1. Middle = B. Without further constraint, ambiguous. CAT-style would expect single answer; reread question: it might be that both case 1 and 2 are valid; but per typical CAT 'who sits in middle' having single answer, given the wording, case 1 likely intended (sequential filling). Marking B as solution acknowledges Case 2; this is a known ambiguity.