The correct answer is not explicitly listed in your options; however, the energy transformation that takes place in a microwave is:
Electrical energy is transformed into heat energy.
Microwaves convert electrical energy into microwaves (a form of electromagnetic radiation), which then causes water molecules in food to vibrate, creating heat.
If you can amend your options, the answer would be:
Electrical energy is transformed into heat energy.
If forced to choose from your options, none of them accurately represent this transformation, but the closest incorrect option would be:
C. Electrical energy is transformed into light energy. (since microwaves do emit some light but primarily transform energy into heat).
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