Which of the Following Is Not One of the Main

Which of the following is not one of the main features of Dalton's atomic theory?

A) Each element is made up of tiny, individual particles called atoms
B) Atoms are indivisible; they cannot be created or destroyed
C) Mass differences among atoms of an element are caused by different numbers of neutrons
D) Atoms of one element are different from atoms of any other element
E) Atoms of one element may combine with atoms of another element to form chemical compounds