Classification (animal–sound): Three pairs correctly match an animal to its characteristic sound; one pair is mismatched. Choose the mismatched pair.

Introduction / Context:
Vocabulary and world knowledge are tested by matching animals to their characteristic sounds. Most pairs are correct; one is intentionally incorrect to test recognition of standard associations.

Given Data / Assumptions:

• Lion → Roar (correct).
• Snake → Hiss (correct).
• Bees → Hum (correct; also “buzz” is used).
• Frog → Croak (standard), not “bleat.”

Concept / Approach:
Check each animal’s widely accepted sound word in English usage. Identify the pair where the mapping is wrong.

Step-by-Step Solution:

Verification / Alternative check:
Cross-validate by recalling common idioms: “roaring lion,” “hissing snake,” “buzzing bees,” “croaking frogs.”

Why Other Options Are Wrong:

Common Pitfalls:
Confusing “bleat” (goats/sheep) with amphibians. Avoid transferring sounds across unrelated animals.

Final Answer:
Frog-Bleat