The main difference between benign and malignant tumors is​

A) ​that malignant cells can invade surrounding tissues.
B) ​the ability of benign tumors to metastasize.
C) ​the size of the tumor each produces.
D) ​that benign tumors attack nearly any tissue, whereas malignancies are specific to animal (including human) tissue cells.

Malignant Tumors

Cancerous growths that have the potential to invade or spread to other parts of the body.

Benign Tumors

Non-cancerous growths in the body that do not invade nearby tissue or spread to other parts of the body.

Metastasize

To undergo metastasis, the spread of malignancy from one part of the body to another by way of the blood or lymph systems.