Select the correct statement with respect to diseases and immunization.
A. If due to some reason B- and T- lymphocytes are damaged, the body will not produce antibodies against a pathogen.
B. Injection of dead/ inactivated pathogens causes passive immunity.
C. Certain protozoans have been used to mass-produce the hepatitis B vaccine.
D. Injection of snake antivenom against snake bite is an example of active immunization.

Hint: Immunization protects people from disease by introducing a vaccine into the body that triggers a particular immune response, just as though you particularly had been exposed to a disease naturally, which is fairly significant.

Complete answer:
Clones of B-cells are called plasma cells which particularly produce antibodies in a big way. For example injection of snake antivenom against snakes for the most part gives a bite that provides artificially acquired sort of passive immunity in a pretty major way. Injection of snake antivenom against snake bite particularly is an example of artificially acquired passive immunity in a generally big way.
T cells and B cells particularly are the basic major cellular components of the adaptive fairly immune response, very further showing how the injection of snake antivenom against snake specifically bite is an example of artificially acquired very passive immunity, which for the most part is quite significant.
 T cells particularly are involved in cell-mediated immunity whereas the B cells mostly are responsible for fairly humoral immunity i.e., relating to antibodies, which for the most part shows that for example injection of snake antivenom against snake bite that provides artificially acquired sort of passive immunity subtly.
 Injection of generally dead inactivated pathogens causes active immunity, fairly further showing how t cells are involved in cell-mediated immunity whereas the B cells are responsible humoral immunity i.e., relating to antibodies, which shows that for example injection of snake antivenom against snake bite that provides artificially acquired fairly passive immunity in a sort of big way.

Hence the correct answer is option A. If due to some reason B- and T- lymphocytes are damaged, the body will not produce antibodies against a pathogen is the correct statement.

Note:
B lymphocytes, the cells that mostly produce antibodies, mostly arise and maturation occurs in the bone marrow in a subtle way, which generally is quite significant. T lymphocytes, the mediators of cellular immunity, for all intents and purposes arise in the bone marrow, and migrate to and sort of mature in the thymus; T lymphocytes essentially refer to thymus-derived lymphocytes, or so they thought.