iron and nickel carbon and oxygen nitrogen and sulfur hydrogen and helium
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: The frost line of the solar system divides the terrestrial plants from the gas-giant planets. What elements make up most of the core of the planets orbiting outside of the frost line?
Possibilities:
- iron and nickel
- carbon and oxygen
- nitrogen and sulfur
- hydrogen and helium

hydrogen and helium