Stars are held together by
a. ionic forces.
c. electrical forces.
b. magnetic forces.
d. gravitational forces.

The correct answer is letter D. gravitational forces. Stars are held together by gravitational forces. The force that is brought by the gravity what makes us always on the ground. We are not flying anywhere. This force is a natural event. It brought objects toward one another such as the planets that orbit around the sun, the stars.

The peak above is part of the  sierra madre occidentals ,  a chain of volcanic mountains that runs through the middle of central america.