They can be solids, liquids, or gases. They come in different sizes and shapes. They combine in different numbers and ratios. They can be a proton, a neutron, or an electron.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: The elements carbon, hydrogen, and oxygen are parts of many different compounds. Which explains why these three elements can make so many different compounds?
Possibilities:
- They can be solids, liquids, or gases.
- They come in different sizes and shapes.
- They combine in different numbers and ratios.
- They can be a proton, a neutron, or an electron.

They combine in different numbers and ratios.