Answer the following question given this paragraph: 

Because electricity can be so dangerous, safety features are built into modern electric circuits and devices. They include three-prong plugs, circuit breakers, and GFCI outlets. You can read about these three safety features in the Figure below . You can learn more about electric safety features in the home by watching the video at this URL: http://www. dailymotion. com/video/x6fg5i_basics-of-your-home-s-electrical-sy_school .


Q: Three-prong plugs, circuit breakers, and gfci outlets are safety features that recognize the danger of what?

 Choices:

- heat

- magnetism

- gravity

- electricity

A:
electricity
