Step 1: Recall industrial peeling methods.
- Knife peeling: Used for large vegetables like potato where precision cutting is required.
- Abrasion peeling: Uses mechanical rubbing, best for smooth vegetables like cucumber.
- Flame peeling: Direct flame burns off skin, effective for brinjal.
- Flash peeling: Steam/pressure loosens skin, commonly used for tomato.
Step 2: Match accordingly.
- P (Knife peeling) → 3 (Potato)
- Q (Abrasion peeling) → 4 (Cucumber)
- R (Flame peeling) → 1 (Brinjal)
- S (Flash peeling) → 2 (Tomato)
Step 3: Verify with options.
This matches with option (A).
Final Answer:
\[
\boxed{\text{(A) P-3, Q-4, R-1, S-2}}
\]