Answer:
1. (B). calcium absorption.
2. (C). rickets.
Step-by-step explanation:
Vitamins are essential biomolecules, required by organisms in small quantity to perform proper body functioning. Vitamin D is mainly responsible for bone formation and bone health as plays major role in absorption of calcium ions.
Vitamin D deficiency can leads to rickets, characterized by soft and fragile bones. Individuals with rickets have higher risks for muscle spams and bone fractures.
Thus, the correct answer is for first blank is 'option). B' and for second blank is 'option). C.'