Here's a problem to solve: Tonya plugged in a toaster. She placed two slices of bread in the toaster, pushed down the lever, and the heating coils glowed. She noticed that only one form of energy toasted the bread. Which form of energy was wasted in the process?

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

- A: infrared heat energy
 
- B: visible light energy
 
- C: chemical energy
 
- D: electrical energy
 