Step 1: Understanding the Concept:
Wheat classification is based on the number of chromosomes (ploidy level) and end-use characteristics. Different species of the genus Triticum are grown globally for various purposes.
Step 3: Detailed Explanation:
1. Common bread wheat (A): Known scientifically as Triticum aestivum. It is a hexaploid wheat and accounts for about $95\%$ of the wheat grown worldwide. (Matches III)
2. Macaroni wheat (B): Known as Triticum durum. It is a tetraploid wheat, high in protein and gluten strength, ideal for making pasta and macaroni. (Matches I)
3. Emmer Wheat (C): Known as Triticum dicoccum. It is an ancient tetraploid wheat, often grown in southern India for preparation of "Upma." (Matches II)
4. Einkorn wheat (D): Known as Triticum monococcum. It is a diploid wheat and is one of the earliest forms of cultivated wheat. (Matches IV)
Step 4: Final Answer:
The correct matching sequence is A-III, B-I, C-II, D-IV.