Explosion : I : : Locust : II     I.   [A] Bomb&nb

Explosion : I : : Locust : II
I. [A] Bomb [B] Ruin [C] Debris [D] Smoke
II. [P] Crop [Q] Holocaust [R] Pest [S] Field

A. AS

B. BR

C. CQ

D. DP

Answer: C . CQ

Justification:

Second is the left-over after the first.