Step 1: Understanding the Concept
Plasma is blood without formed elements. The analogy asks for the similar description of lymph.
Step 2: How lymph is formed
Lymph forms from tissue fluid that leaks from capillaries. RBCs, platelets and large plasma proteins stay inside the blood vessels.
Step 3: Compare the options
Lymph does contain white cells, especially lymphocytes, so options mentioning loss of WBCs are wrong. The right choice is blood without RBCs, platelets and some proteins.
Final Answer:
Lymph is blood without RBCs, platelets and some proteins.
\[ \boxed{\text{(C) }\text{Blood without RBC, platelets and some proteins.}} \]