Oncogenes promote the division of cells with damaged DNA, and carcinogenic or oncogenic effects cause cancer. Given these facts, cells with damaged DNA are more likely to divide when exposed to what among the following options:
- harmful substances
 - apoptotic genes
 - sulfur dioxide
 - a tumor suppressor
 - Electrical energy
 - heat or cold
 - immune system
 - a carcinogen


 

        a carcinogen 