Calorie reserve is mainly due to Subcutaneous fat, which stores excess energy.
Vitamin D synthesis primarily involves Keratinocytes in the skin, which help convert precursors using sunlight.
Temperature Regulation is controlled by Eccrine glands through sweat production.
Body Odour results from secretions of Apocrine sweat glands which interact with skin bacteria.
Therefore, the correct match is (A)-(II), (B)-(I), (C)-(III), (D)-(IV).