Fact 1: Constriction occurs when the muscular walls of blood vessels contract.

Fact 2: Cocaine constricts the blood vessels.

Given the two facts above, answer the question "What does cocaine make blood vessels do?" with the following options: 
- It expands
 - contract
 - reduce
 - It decreases
 - harm them
 - kill them
 - Rise
 - Damages them


 

  contract       