Which of the following statements BEST describes a compound?
(10 Points)
A. A compound is composed of atoms from two or more different kinds of elements that are chemically combined.
B. A compound is a molecule composed of two or more atoms from the same element that are chemically combined.
C. A compound is a pure substance composed of one atom from one type of element.
D. A compound is an atom composed of two or more molecules from only one element.