Any force that causes an object to move in a circle is called a (n)

a. balanced force.

b. unbalanced force.

c. gravitational force.

d. centripetal force.

A). balanced force

b). unbalanced force

There's no such thing as either of these. A group of two or more forces can be balanced or unbalanced. A single force can't be.

c). gravitational force ... doesn't cause an object to move in a circle;

Drop a stone from the roof of a tall building and watch it fall.

It goes straight down, not in a circle.

d). centripetal force ... force directed toward the center of a circle,

causes an object to move in a circle.