Final answer:
Metal oxides, peroxides, and superoxides form bases when dissolved in water.
Step-by-step explanation:
Many metal oxides, peroxides, and superoxides form bases when dissolved in water.
Most metal oxides are base anhydrides and will react with water to form metal hydroxides. For example, when sodium oxide (Na2O) dissolves in water, it forms sodium hydroxide (NaOH), which is a strong base. Similarly, peroxides and superoxides also form bases when dissolved in water. For instance, potassium peroxide (KO2) reacts with water to produce potassium hydroxide (KOH) and oxygen gas (O2).
Therefore, the correct answer is B) Bases.