They would all be probable causes. Carcinogenicity usually just means that certain substances cause cells to undergo mutations, which could then possibly lead to cancer. However some substances are known to cause specific types of cancer due to the nature of how and where we are exposed to them i.e. skin, lungs, systematic, etc.. Certain chemicals also accumulate in different tissues and would be more likely to cause cancer there. Others get metabolized by the liver and only turn carcinogenic then and there.