Most scientists support the thought that the sun and planets in our solar system have formed from a nebula of gases and dust that have condensed. What is the best explanation for the reason why these materials condensed?
A. The gravitational pull toward the center of the nebula.
B. The density of hydrogen gases quickly increased.
C. The attraction of the positively charged and negatively charged particles in the material.
D. The transfer of the thermal energy from the process of nuclear fusion at the center of the nebula

Question

Most scientists support the thought that the sun and planets in our solar system have formed from a nebula of gases and dust that have condensed. What is the best explanation for the reason why these materials condensed?
A.		 The gravitational pull toward the center of the nebula.
B.		 The density of hydrogen gases quickly increased.
C.		 The attraction of the positively charged and negatively charged particles in the material.
D.		 The transfer of the thermal energy from the process of nuclear fusion at the center of the nebula