Which of the Following Statements About the Lymphatic System Is

Which of the following statements about the lymphatic system is true?

A) Lymph flow is propelled by the contraction of the heart.
B) The flow of lymph is slow compared with that of blood.
C) One of the functions of the lymph is to absorb lipids from the biliary tract.
D) Lymph vessels have no valves,so there is a free flow of lymph from the tissue spaces into the bloodstream and back again.