Final answer:
The correct answer is A. Lymphatic system. Metastasis is the spread of cancer cells from one part of the body to another, and carcinomas commonly spread through the lymphatic system.
Step-by-step explanation:
The correct answer is A. Lymphatic system.
Metastasis is the spread of cancer cells from one part of the body to another. Carcinomas are a type of cancer that commonly spreads through the lymphatic system. The lymphatic system is a network of vessels and organs that help remove waste, toxins, and other harmful substances from the body. Cancer cells can enter the lymphatic vessels and travel to nearby lymph nodes, where they can then spread to other parts of the body through the bloodstream.
For example, if a person has breast cancer, the cancer cells can enter the lymphatic vessels in the breast and travel to the nearby lymph nodes in the armpit. From there, the cancer cells can spread to other lymph nodes and eventually enter the bloodstream, leading to metastases in distant organs such as the lungs, liver, or bones.