Which of the following is a chemical compound composed of more than one element?

A chemical compound is defined as a substance formed when two or more different elements are chemically bonded together. Each of the listed substances meets this criterion.

Arsenic sulfide is made up of arsenic and sulfur, which are two distinct elements combined through a chemical reaction. Carbon dioxide consists of carbon and oxygen, also elements that combine in a fixed ratio to form the compound. Water, composed of hydrogen and oxygen, is another clear example where two different elements bond to create a compound.

Since all these options consist of more than one element bonded together, the answer indicating that all of them are chemical compounds is appropriate. This understanding of compounds as combinations of various elements helps to clarify the nature of the substances in the question.