Are the source of antibody-producing cells.
a. b cells
b. macrophages
c. plasma cells
d. t cells
e. monocytes

Option C. "Plasma cells"

Explanation:

An antibody can be defined as a protein produced by the plasma cells which are utilize by immune system able to bind with specific antigen that protects body from diseases.

Plasma cells are antibody-producing cell that originates from B cell. The antibody produced from plasma cells are released into body and lymph, these antibody molecules bind to the target antigen and allow destruction or neutralization.

Hence, the correct option is C.

answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle cells;