Which of the following vitamin is needed for bones and teeth?

Q. Which of the following is a water-soluble vitamin?
(a) vitamin C
(b) vitamin A
(c) vitamin D
(d) vitamin K

Q. Explain the importance of the following vitamins for the body.
(a) vitamin A
(b) vitamin C
(c) vitamin D
(d) vitamin K

Q. The human body needs the following vitamins. Arrange them in the increasing order of their requirement.
(a) Vitamin A
(b) Vitamin D
(c) Vitamin E
(d) Vitamin K

Q. Deficiency disease, chemical name and molecular formula of following vitamins.
(a)vitamin $A$
(b)Vitamin $B$
(c)Vitamin $C$
(d)Vitamin $D$
(e)Vitamin $E$
(f)Vitamin $K$

Q. Vitamin - ?
Name of the deficiency diseases - Rickets (in childhood bones turn soft)
Source of Vitamin - ?
Function of vitamin - ?