What is metabolism?

I- Metabolism is the set of changes made between the organism and the environment that surrounds it.
II- Metabolism includes degradative reactions, used primarily to obtain energy, and biosynthesis reactions, through which the formation of molecules that use catabolic energy is produced.
III- Combustibles exógenos are obtained directly from organic deposits such as glycogen and triglycerides.
IV- Nutrition is the voluntary decision of the person by which he or she chooses a series of products, the foods, which through food will provide the necessary nutrients to cover the objectives of nutrition.
a) I and II are correct.
b) II and III are correct.
c) III and IV are correct.
d) I and IV are correct.