Here's a problem to solve: Four significantly different household appliances (blender, mixer, toaster, and food processor) are plugged into four outlets along a counter. Turning on or off one or more of the appliances does not affect the performance of the other appliances because the four appliances

Among the 4 following options, which is the correct answer?

- A: run on a direct current.
 
- B: are connected in series.
 
- C: are connected in parallel.
 
- D: run on an alternating current.
 