Fact 1: Dilation occurs when cell walls relax.

Fact 2: Larger, dilated pupils are seen as more attractive than smaller, contracted pupils.

Given the two facts above, answer the question "What becomes larger when cell walls relax?" with the following options: 
- shrub beds
 - wave in air
 - a cuticle
 - It expands
 - layers of fat
 - an object
 - sensory neurons
 - the pupils


 

        the pupils 