Final answer:The correct answer is C. OH, known as the hydroxyl radical, which consists of anoxygen and hydrogenatom with an unpaired electron, making it highly reactive.Explanation:The question asks,which of the following is a radical?A radical in chemistry is an atom, molecule, or ion that has unpaired valence electrons, which makes them highly reactive. Here are the choices broken down:Osignifies an oxygen atom, which can be a radical when it has unpaired electrons, but on its own it's usually not considered a radical.Hsignifies a hydrogen atom, which is generally not a radical; it has a single electron that pairs when it forms bonds.OH, or hydroxyl, is indeed a radical with an unpaired electron, making it highly reactive and an important species in many chemical processes.H2Orepresents water, which is a stable, non-radical molecule with all electrons paired.Therefore, the correct answer isC. OH, which is the hydroxyl radical.Learn more about Radical here:brainly.com/question/34479970#SPJ1...

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