Question: Which of the following statements best describes the role of gravity in the formation of stars?

  Options: 
 A. Gravity converts solid matter into gases and light energy.
 B. Gravity causes gases and dust particles to condense into spheres.
 C. Gravity cools gases and liquids until they become one solid mass.
 D. Gravity pushes rocks and dust particles outward from a dense center.
Answer: B