The correct option is D Both a and c
Blood consists of plasma and formed elements or blood cells. WBC, RBC and platelets are the various blood cells which are suspended in the plasma. Plasma is composed of water and few proteins.
The fluid present in the lymphatic system is called the lymph. Lymph is a colourless fluid containing specialised lymphocytes which are responsible for the immune responses of the body.
Plasma without the clotting factors is called serum.
So, the correct answer is option 'd'.