Option C, The vaccines can help build immunity to many different pathogens.
Explanation:
In the statement it is said that vaccination can not be taken as it causes diseases. Thus, opposite to this would be option C where it is mentioned that all individuals are capable of taking vaccines irrespective of any chance of danger.
The vaccines acts as an antibody and attacks the immunity system there by producing bio chemicals that are able to retrace the history of any such pathogen attack in future and thus could react in a shorter span of time and prevent the occurrence of any disease.
The answer is a. accessible population because an accessible population is the portion of the target population to which the researcher has reasonable access.
