Final answer:
Water (H2O) is the correct answer as it is a compound consisting of hydrogen and oxygen chemically bonded together.
Step-by-step explanation:
Among the options provided (Lead, Wood, Potassium, Water), water is a compound. A compound is a substance made up of two or more different elements chemically bonded together. Water, with the chemical formula H2O, consists of two hydrogen atoms and one oxygen atom bonded together.
Lead is an element, wood is a complex mixture of various organic compounds including cellulose, lignin, and others, and potassium is also an element. Thus, water is the correct answer as it is a pure substance formed by the chemical union of hydrogen and oxygen.