Which of the following statements about a compound is true?
A. The physical and chemical properties of a compound are usually very different from those of the elements from which it is formed.
B. Only the physical properties of a compound are usually the same as those of the elements from which it is formed.
C. Only the chemical properties of a compound are usually the same as those of the elements from which it is formed.
D. The physical and chemical properties of a compound are usually the same as those of the elements from which it is formed.