You are presented with the question "Most people can survive only a few days without a combination of what?" and the following answer choices: 
- dehydration
 - hydrogen and oxygen
 - food and shelter
 - hydrogen chloride and water
 - scarce resources
 - solid, liquid, gas
 - lemonade and ice water
 - watercolor paints

Now knowing that most people can survive only a few days without water and water combines hydrogen and oxygen, choose the best answer.


 

  hydrogen and oxygen       