Step 1: Understanding the Concept:
Nutrient deficiencies cause specific symptoms.
We need to match each nutrient with its symptom.
Step 2: Key Formula or Approach:
No specific formula.
Need to know nutrient deficiency symptoms.
Step 3: Detailed Explanation:
Sulphur deficiency: chlorosis starting from leaf tips on older leaves (A-II).
Phosphorus deficiency: youngest leaf is brownish or dead (B-III).
Nitrogen deficiency: reddish colour on older leaves (C-I).
Boron deficiency: mottled yellow-green leaves on younger leaves (D-IV).
Thus, A-II, B-III, C-I, D-IV is the correct matching.
Step 4: Final Answer:
The correct matching is A-II, B-III, C-I, D-IV.
Hence, the correct option is (B).