Final answer:
Administering tetanus toxin mixed with specific antibodies to mice will result in the antibodies neutralizing the toxin, thus protecting the mice. This provides passive immunity, offering immediate protection without inducing active immunity in the host. Therefore, the correct option is C.
Step-by-step explanation:
If tetanus toxin is mixed with antibodies against the toxin and then administered to mice, the result will be that the antibodies neutralize the toxin and protect the mice. This is because the antibodies will bind to the toxin, preventing it from exerting its harmful effects on the host's nervous system. This type of protection is an example of passive immunity, where the mouse is given pre-formed antibodies rather than producing them through active immune response.
This intervention does not lead to the mouse developing active immunity, as the immune system is not responsible for producing the antibodies. Rather, the mouse’s protection is immediately provided by the administered antibodies. This kind of immunization strategy is often used when immediate protection is required, as in the case of potential exposure to a pathogen where there isn’t enough time for the body to mount its own immune response.