Answer:
b
dissolving is a chemical change
I believe that the answer is A, if I am not mistaken!
B temperature and precipitation
Catalyst. A catalyst is a substance that increases the rate of a reaction without being consumed the rate of a reaction without being consumed in process, or being chemically altered. There are many enzymes present in cells, proteases, lipases, that speed up metabolism, and catalysts .
hOpe this has helped you any . >)