The answer to this question would be:
B.metabolism
B.catabolic
Metabolism is the set of chemical processes carried out by an organism in order to sustain life. This reaction can be divided into two kind: anabolism, and catabolism. Anabolism is rection that will make big molecule from many smaller molecule. This happens when the cell is growing.
Catabolism is a reaction that will break down the big molecule into many smaller molecule. This happens when you are digesting food. The enzyme will break down starch into glucose, protein into amino acids, etc.
