Why Is Having an Understanding of the Lymphatic Drainage of the Breast

Why is having an understanding of the lymphatic drainage of the breast important in formulating the diagnosis and treatment of breast cancer?

A) A single cell of a primary cancer tumor can spread to other areas of the body through the lymphatic system and cause metastasis.
B) Removing the cancer can stop drainage of blood from the tumor and increase the flow of drainage of lymph from the breast area.
C) The lymphatic drainage will start to clot and decrease further lymphatic drainage.
D) The cancerous breast tissue will decrease lymphatic drainage, thus inhibiting the spreading of the tumor cells.