Which type of reaction primarily uses oxidation and reduction?

The correct answer is C, redox reaction, because redox, or reduction-oxidation reactions, are characterized by the transfer of electrons between reacting species. In these reactions, one substance is oxidized, meaning it loses electrons and increases its oxidation state, while another substance is reduced, meaning it gains electrons and decreases its oxidation state. This electron transfer is fundamental to many chemical processes, including energy production in biological systems and various industrial applications.

Both double displacement and acid-base reactions do not primarily involve changes in oxidation states or electron transfers. Double displacement reactions typically involve the exchange of ions between two compounds to form new compounds, while acid-base reactions involve the transfer of protons (H+) rather than electrons. Single displacement reactions do involve some level of oxidation and reduction but are more limited in scope compared to the broader category of redox reactions. In summary, redox reactions are the primary type of reaction that focuses on oxidation and reduction processes.