Question

Which correctly compares the immunity produced by a vaccine with the immunity produced by injection of antibodies from an external source?

Answer 1

A vaccine actively attacks pathogens until it is used up so immunity is temporary, whereas injected antibodies will remain passively in the blood, giving immunity for life.
A vaccine helps the body develop memory cells that make immunity last, whereas injection of antibodies only produces a temporary immunity.
Injection of antibodies helps the body develop memory cells, which only produces a temporary immunity, whereas a vaccine can fight infection for years.
Injection of antibodies helps the body develop its own copies of the antibodies so immunity lasts, whereas a vaccine only produces a temporary immunity.

Answer 2

The right answer is the second one "A vaccine helps the body develop memory cells that make immunity last, whereas injection of antibodies only produces a temporary immunity.".
Vaccines are introduction of antigens in the body to promote an immune response and persistent immunity.
Antibodies injections are used to stop the antigens either because the body should not create it's own antibodies against the antigen (like to prevent Hemolytic Disease of the Newborn) or because the body would not have time to create it's own antibodies (like in Tetanus)

Answer 3

thanks for the help