Answer:
It is called a Radiation Threat
Explanation:
I know this because it talked about this in My social studies class
People use the words “sprain” and “strain” almost interchangeably, to describe everything from a twisted ankle to a pulled hamstring. But they're not the same. A sprain is a stretch or tear in a ligament. Ligaments are bands of fibrous tissue that connect bones to bones at joints.
D is the answer... Think about every time you get cold you shiver its a natural thing that humans do to stay warm
D ............................................
