You are presented with the question "What causes frostbite of tissue?" and the following answer choices: 
- an object
 - hydrogen bonds
 - heating liquids
 - Veins and arteries.
 - Generating heat
 - evaporation
 - heat produced
 - dehydration

Now knowing that hydrogen bonds cause water to expand when it freezes and frostbite is the actual freezing of tissue, choose the best answer.


 

  hydrogen bonds       