The option that best describes the process of an electric generator is motion causes constantly changing magnetic fields to induce electrical energy. Thus, the correct option is A.
What is an Electric generator?
An electric generator may be defined as an instrument or an electric device that converts mechanical energy into electrical energy.
An electric generator works on the principle of electromagnetic induction that constantly alters magnetic fields to provoke the conversion of mechanical into electrical.
Therefore, the correct option for this question is A.
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