Difficulty: Medium
Correct Answer: B
Explanation:
Introduction / Context:
We are to place five entities in a line with “between” and end-point constraints, then identify C’s left neighbor.
Given Data / Assumptions:
Concept / Approach:
Try feasible placements respecting ends and the E–A–B chain, then confirm each clue.
Step-by-Step Solution:
Put D at the left end to satisfy “E is to the right of D.”Choose D=1. To fit E–A–B, assign E=2, A=3, B=4; then C (the other end) must be at 5.Check all constraints: ends C (5) and D (1) ✔; E right of D ✔; A between E and B ✔.Thus C’s immediate left neighbor is position 4 → B.
Verification / Alternative check:
Trying D at the right end contradicts “E is to the right of D,” so the derived arrangement is essentially forced.
Why Other Options Are Wrong:
E/A/D do not occupy position 4 in any valid arrangement meeting all constraints.
Final Answer:
B
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