If a Tumor Metastasizes,some of Its Cells Move to Another

If a tumor metastasizes,some of its cells move to another part of the body.Doctors often look in lymph nodes near a tumor for signs of metastasis.Why might cancer cells be found in lymph nodes?

A) The tumor started in the lymph node.
B) The lymphatic system collects fluids and cells from tissues.
C) White blood cells are formed in lymph nodes in response to the tumor.
D) The tumor is recognized as a foreign antigen and is being attacked.
E) The tumor cells may have moved from the blood into the lymph with the plasma.