Step 1: Understanding the Concept:
This question requires matching specific nutrients/constituents with the crops that are exceptionally rich sources of them.
Step 2: Detailed Explanation:
Let's match the constituent to its rich source:
\[\begin{array}{rl} \bullet & \text{(A) Beta Carotene: This is a precursor to Vitamin A. (II) Mango is famously one of the richest fruit sources of beta carotene, which gives its flesh the characteristic orange-yellow color. } \\ \bullet & \text{(B) Ascorbic Acid: This is Vitamin C. (IV) Barbados Cherry (*Malpighia emarginata*) is one of the richest known natural sources of Vitamin C in the world. } \\ \bullet & \text{(C) Riboflavin: This is Vitamin B2. (III) Bael (*Aegle marmelos*) fruit pulp is an exceptionally rich source of riboflavin. } \\ \bullet & \text{(D) Niacin: This is Vitamin B3. Among the given options, (I) Fig is a good source of niacin. } \\ \end{array}\]
The correct matching is: A \(\rightarrow\) II, B \(\rightarrow\) IV, C \(\rightarrow\) III, D \(\rightarrow\) I.
Step 3: Final Answer:
The correct set of matches corresponds to option 2.