Concept:Determine the order of five students in a row using given positional constraints.
Explanation:From "D is on the right of E": E is left of D.
From "B is on the left of E but on the right of A": A is left of B, and B is left of E, so order A...B...E.
From "D is next to C on his left": C is immediately left of D, so C D.
Combining: A...B...E...C D. With five positions, the only possible sequence from left to right is A, B, E, C, D.
The middle (third) position is E.
Answer:E