Final answer:
The composition of lymph is most similar to blood plasma without the plasma proteins, as lymph is essentially the same as interstitial fluid, which is a component of the extracellular fluid and resembles plasma.
Step-by-step explanation:
The composition of lymph is most similar to blood plasma without the plasma proteins, and it is a part of the interstitial fluid, which in turn is a component of the extracellular fluid. This fluid is responsible for providing nutrients and a means of waste removal for the cells of the body. Lymph is the term used for interstitial fluid that has entered the lymphatic system, where it is eventually returned to the bloodstream.
Therefore, the best answer to the question is B) blood plasma. Lymph resembles blood plasma but without the blood plasma proteins. This similarity arises from the fact that lymph originates as plasma that filters out of the capillaries into the interstitial fluid, before being collected by the lymphatic system.