Which statement is true about oxidation-reduction reactions? a. every oxidation must be accompanied by a reduction. b. there are four commonly accessed oxidation states of carbon. c. dehydrogenases typically remove two electrons and two hydrides. d. they usually proceed through homolytic cleavage. e. during oxidation a compound gains electrons.

Every oxidation must be accompanied by a reduction.

Explanation:

Oxidation and reduction are complementary processes. There can be no oxidation without reduction and vice versa. It is actually a given an take affair. A specie looses electrons which must be gained by another specie to complete the process. This explains why the selected option is the correct one.

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c-14 is carbon-14, or radiocarbon.   it is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.