To solve this, we match the reactants with their respective functions:
- I. Vitamin E is a known antioxidant and often used to prevent oxidation in oils, thus it corresponds to R, antioxidant with vitamin A in oils.
- II. Calcium salts are commonly used in food processing to reduce shrinkage losses, especially in fruits and vegetables, so it matches with Q, reduces shrinkage losses.
- III. Edible waxes are often applied on fruits and vegetables to retain moisture and freshness, making it match with S, firming agent in fruits.
- IV. Methyl Bromide is a fumigant used for insect control, so it matches with P, fumigant for insect killing.
Thus, the correct match is (D) I-R, II-S, III-Q, IV-P.