Difficulty: Medium
Correct Answer: The Statements I and II together are not sufficient to answer the question.
Explanation:
Introduction / Context:
We must identify the youngest using partial order relations among four people.
Given Data / Assumptions:
Concept / Approach:
Combine the inequalities and see if a unique minimum (youngest) is forced.
Step-by-Step Solution:
Verification / Alternative check:
No contradiction arises in either case; thus no unique youngest is identified.
Why Other Options Are Wrong:
Common Pitfalls:
Assuming transitivity across disjoint chains (K vs D) to infer M vs N.
Final Answer:
C — Together not sufficient.
Discussion & Comments