Which statement describes a controlled experiment? A. It includes two groups, both of which are exposed to the factor
being tested.
B. It includes a group exposed to one of the factors being tested and
a group that is exposed to another of the factors being tested.
C. It includes a group exposed to the factor being tested and a group
that is not exposed to the factor being tested.
D. It includes two groups, neither of which is exposed to the factor
being tested.

The answers is c, a group exposed to the factor being tested, and a group that isn’t exposed to the factor tested.

Explanation:

the displacement produced by the body.  

the amount of force subjected to the body.  

the angle between the direction of force and displacement

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.