Six friends A, B, C, D, E, F sit in a row facing East. C is between A and E. B is immediately to the right of E but to the left of D. F is not at the right end. Who is at the right end?

Introduction / Context:
We must complete a six-seat row given adjacency and “between” relations, then identify the rightmost person.

Given Data / Assumptions:

• C lies between A and E.
• B is immediately to the right of E and to the left of D ⇒ E–B–…–D with B next to E.
• F is not at the right end.

Concept / Approach:
Because B is right of E and left of D, D must be to the right of (E,B). Place the trio (E,B,D) toward the right side, then fit A and C with “C between A and E,” and place F in the remaining slot (ensuring F is not at the right end).

Step-by-Step Solution:
A valid arrangement is: A, F, C, E, B, D (left→right).Checks: C between A and E (A–C–E yes); B immediately right of E (E–B yes) and left of D (B left of D yes); F not at right end (true).Therefore, the right end is D.

Verification / Alternative check:
Other valid permutations respecting all constraints still end with D at the extreme right.

Why Other Options Are Wrong:
They misplace the immediate-right requirement or put F at the right end against the rule.

Common Pitfalls:
Making C adjacent to A and E but not strictly between them in the row order.

Final Answer:
D