The correct option is A White blood cells
Our blood has two main components - plasma and formed elements. Formed elements which are found suspended in the fluid plasma. They include RBCs, WBCs and platelets.
WBCs or White Blood Cells help our body in fighting against the disease causing microbes.
RBCs or Red Blood Cells help in the transport of gases and nutrients.
Platelets function in the clotting of blood during an injury.