You are presented with the question "What can cause a rainbow?" and the following answer choices: 
- photosyntehsis
 - tornadoes
 - sun and hot weather
 - snowfall and fog
 - chemical messengers
 - sun and liquid precipitation
 - algae and plants
 - photosynthetic pigments?

Now knowing that sunlight and rain can cause a rainbow and liquid precipitation is measured with a rain gauge, choose the best answer.


 

      sun and liquid precipitation   