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 "Which material slows the transfer of electricity?" with the following options: 
- Cotton
 - Water
 - Smoking
 - heat
 - the skin
 - Steel
 - cigarettes
 - Plastic


 

        Plastic 