Final answer:
Cancers are classified according to the type of tissue they affect.
Step-by-step explanation:
The statement that BEST describes how cancers are classified is A. Cancers are classified according to the type of tissue they affect. Cancer classification is primarily based on the type of tissue or cell that has become cancerous. For example, some common types of cancers include lung cancer, breast cancer, and prostate cancer, each named after the specific tissue or organ they affect.
Learn more about classification of cancers