You are presented with the question "What can change the color of an environment from green to brown?" and the following answer choices: 
- the ocean
 - a lack of water
 - rain
 - harmful substances
 - sleet
 - deforestation
 - Greenhouse gases
 - Greenhouse gasses

Now knowing that adrought can change the color of an environment from green to brown and due to the drought, there is no water, choose the best answer.


 

  a lack of water       