the size of the planets gravitational pull of the Sun the composition of the planets electromagnetic radiation from the Sun
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Planets in the solar system are in constant motion. What factor has the greatest effect on the orbits of the planets?
Possibilities:
- the size of the planets
- gravitational pull of the Sun
- the composition of the planets
- electromagnetic radiation from the Sun

gravitational pull of the Sun