Doctors do not administer vaccinations to people who are too sick. Which best explains why?

-The weakened or dead form of the pathogen may be attacked by ther person's immune system.

-The weakened or dead form of the pathogen may have a fatal effect when it is combined with medication that the sick people are taking.

-The digestive systems of sick people may be negatively affected by the weakened or dead pathogen.

-The white blood cells of sick people may not be able to efficiently handle the weakened or dead form of the pathogen.