burns at a cooler temperature. is always larger than other suns. has greater density and gravity. fuses hydrogen to make helium.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: A red giant star differs from main sequence stars because it
Possibilities:
- burns at a cooler temperature.
- is always larger than other suns.
- has greater density and gravity.
- fuses hydrogen to make helium.

burns at a cooler temperature.