You are presented with the question "what causes stars to produce light?" and the following answer choices: 
- by making heat
 - Generating heat
 - converting mass to energy
 - photosyntehsis
 - photosynthetic pigments?
 - Evaporation of water
 - heat production
 - hydrogen and oxygen

Now knowing that nuclear reactions in stars causes stars to produce light and nuclear reactions convert mass to energy, choose the best answer.


 

   converting mass to energy      