Step 1: Understanding the Concept:
Different crops have specific scientific names.
We need to match each crop with its scientific name.
Step 2: Key Formula or Approach:
No specific formula.
Need to know the botanical names.
Step 3: Detailed Explanation:
Oats: Avena sativa (A-IV).
Barseem: Trifolium alexandrinum (B-I).
Lucern: Medicago sativa (C-III).
Guar: Cyamopsis tetragonoloba (D-II).
Thus, A-IV, B-I, C-III, D-II is the correct matching.
Step 4: Final Answer:
The correct matching is A-IV, B-I, C-III, D-II.
Hence, the correct option is (A).