Which of the following takes place during a redox reaction? A. Electrons are gained only. B. Electrons are lost only. C. Electrons are both gained and lost. D. Electrons are neither gained nor lost.

In a redox reaction C. Occurs, Electrons are both gained and lost.

I believe the correct answer from the choices listed above is option C. Electrons are both gained and lost during a redox reaction. From the name itself "redox" or reduction-oxidation, it must be that something has reduced and another has gained that something.