**Core Concept**
Lymphatic vessels play a crucial role in the immune system by draining interstitial fluid, proteins, and pathogens, ultimately returning them to the bloodstream. The lymphatic system is also responsible for the transport of lipids and fat-soluble vitamins from the digestive system to the bloodstream.

**Why the Correct Answer is Right**
The lymphatic system consists of lymphatic vessels, lymph nodes, lymphoid organs, and lymphoid tissues. Lymphatic vessels are found in most parts of the body, including the skin, gastrointestinal tract, respiratory tract, and musculoskeletal system. They are essential for the absorption of fats and fat-soluble vitamins from the small intestine and for the removal of excess protein and fluid from tissues. The lymphatic vessels are also involved in the transport of immune cells, such as lymphocytes, to lymphoid organs where they can participate in immune responses.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because while lymphocytes are involved in immune responses, they are not the primary component of the lymphatic system.
**Option B:** This option is incorrect because while the lymphatic system is involved in the transport of nutrients, it is not primarily responsible for the absorption of glucose and amino acids.
**Option C:** This option is incorrect because while the lymphatic system is involved in the removal of excess protein and fluid from tissues, it is not primarily responsible for the removal of waste products from the body.

**Clinical Pearl / High-Yield Fact**
One key function of the lymphatic system is the transport of chylomicrons, which are lipoprotein particles that contain dietary fats, from the small intestine to the bloodstream. The lymphatic system plays a crucial role in maintaining the balance of lipids in the body and preventing the accumulation of excess fat in tissues.

**Correct Answer: C. All of the above.**