Fact 1: An electrical insulator slows the transfer of electricity.

Fact 2: Plastic is an insulator of electricity.

Given the two facts above, answer the question "What slows the transfer of electricity?" with the following options: 
- Salt Water
 - toxins
 - Gold
 - sweating
 - the skin
 - Steel
 - Plastic
 - cold air


 

       Plastic  