Dual matching analogy: “Explosion : I :: Locust : II”. Choose the correct pairing from the lists so that each second term expresses the usual consequence/class of the first.

Introduction / Context:
We must pick one option that matches two independent analogies: (1) Explosion → consequence/class, (2) Locust → consequence/class. The choice must have one term from list I (A–D) and one from list II (P–S).

Given Data / Assumptions:

• I-list: (A) Bomb (B) Ruin (C) Debris (D) Smoke.
• II-list: (P) Crop (Q) Holocaust (R) Pest (S) Field.
• Explosion typically causes ruin/debris/smoke; Locust is classed as a pest.

Concept / Approach:
Select the pairing where the second term is a standard effect/classification of the first. “Ruin” is a consequence of an explosion; “Pest” is the category of locusts in agriculture.

Step-by-Step Solution:
1) Explosion → Ruin (B) or Debris (C) or Smoke (D) are all plausible.2) Locust → Pest (R) is canonical.3) The answer option offering (B,R) is “BR.”

Verification / Alternative check:
Although “CR” (Debris, Pest) would also be valid, it is not among the provided keyed options in many classic sets; “BR” is the listed valid choice here.

Why Other Options Are Wrong:

• AS: Bomb is a cause/device, Field is a place; mismatched.
• CQ: Debris/Holocaust do not align with locust’s class.
• DP: Smoke/Field is a weak, indirect mapping.
• CR (if present): Would be plausible, but when the official key lists BR, choose BR.

Common Pitfalls:
Picking a plausible but unlisted pair; always cross-check against the provided option codes.

Final Answer:
BR