What happens in a decomposition reaction? O A. Two or more substances combine to form one substance. B. Two ions trade places. O C. Larger compounds break down into two or more smaller compounds O D. The charges of the atoms change.

Answer:
C. Larger compounds break down into two or more smaller compounds.
Explanation:
During a decomposition reaction, the bonds between the atoms break down in the starting substance. The atoms then rearrange to form new bonds, resulting in new substances with properties different from the starting material.