Which of the following is an example of an element?

A. salt
B. carbon dioxide
C. water
D. oxygen

1 answer

D. oxygen is an example of an element.

Salt (A) is a compound made of sodium and chlorine, carbon dioxide (B) is a compound made of carbon and oxygen, and water (C) is a compound made of hydrogen and oxygen. Oxygen, on the other hand, is a pure element.