Match the following.

List-I	List-II
a. Carbohydrates	1. Rigidity to bones
b. Amino acids	2. Synthesis of proteins
c. Phosphorous	3. Building block of proteins
d. Potassium	4. Facilitates excretion

A. a-4, b-3, c-1, d-2

B. a-1, b-3, c-2, d-4

C. a-3, b-2, c-4, d-1

D. a-2, b-4, c-3, d-1

Answer: Option A