Which one supports the solar nebula theory of the origin of the solar system?

a.Disks are rare around young stars.
b.Disks are common around young stars.
c.The sun is the least massive object in the solar system.
d.Planets are round.

b is not even true. Planet shape (d) has nothing to do with the origin of the solar system. That leaves a and b. Which makes more sense to you? Planets have to form out of something orbiting the star at different distances

To determine which option supports the solar nebula theory of the origin of the solar system, we need to understand what the theory entails. The solar nebula theory suggests that the solar system formed from a rotating disk of gas and dust called the solar nebula. This disk eventually collapsed under its own gravity, giving rise to the Sun and the planets.

Now let's examine each option to find the one that aligns with the solar nebula theory:

a. Disks are rare around young stars: This option implies that disks are not commonly found around young stars. However, the solar nebula theory suggests that disks are indeed common around young stars. These disks are the initial stages of planet formation.

b. Disks are common around young stars: This option supports the solar nebula theory. If disks are common around young stars, it suggests that the same process of disk formation that led to the formation of our solar system is likely to occur elsewhere in the universe.

c. The sun is the least massive object in the solar system: While this statement is true, it does not directly relate to the solar nebula theory. The theory is primarily concerned with the formation of the Sun and the planets from the collapsing disk, rather than their relative masses.

d. Planets are round: This option does not provide direct support for the solar nebula theory. The round shape of planets is a result of their gravitational forces compressing the matter into a spherical shape over time. However, it does not address the origin or formation of the solar system as proposed by the solar nebula theory.

Therefore, the option that supports the solar nebula theory of the origin of the solar system is: b. Disks are common around young stars.