A person develops an elevated body temperature from a bacterial
infection. This fever is a response
from the body to help fight the
infection by —A increasing the body's heartbeat
rate
B increasing the energy level of the
body
C slowing the growth of the bacterial
infection
D stopping additional bacteria from
entering the body

The correct answer is - C. slowing the growth of the bacterial  infection.

Explanation:

If an individual is infected with a bacterial infection there is a requirement of a huge number of immune cell production to fight with infection and slow the production f the bacterial and prevent its growth in the body. An increase of these white blood cells affects the hypothalamus which leads to the heat up the body known as fever.

Fever helps the white blood cells to move along the walls of the blood vessels so it can prevent the invasion of the bacteria in the blood and grow. Thus the slowing of the growth of the bacterial infection leads to fever in the infected organism.