According to our theory of solar system formation, what three major changes occurred in the solar nebula as it shrank in size?

a. Its gas clumped up to form the terrestrial planets, nuclear fusion produced heavy element to make the Jovian planets, and center temperatures rose to more than a trillion Kelvin

b. It gained energy, it gained angular momentum, and it flattened into a disk

c. Its mass, temperature, and density all decreased

d. It got hotter, its rate of rotation increased, and it flattened into a disk. anlatam​