Fact 1: Light enters the eye through an opening called the pupil.

Fact 2: Dilation makes the eye very sensitive to sunlight.

Given the two facts above, answer the question "What makes the pupils sensitive?" with the following options: 
- environment
 - nerves
 - heat
 - air
 - ultraviolet light
 - dilation
 - infrared light
 - light


 

      dilation   