Which of the following statements is NOT true about electron configurations?

A)If an atom has only one shell,it is complete with two electrons.
B)If an atom has two or more shells,the octet rule applies.
C)If an atom has two or more shells,the outer shell is complete with eight electrons.
D)Atoms with more than eight electrons in the outer shell react by gaining electrons.
E)Atoms with eight electrons in the outer shell are not reactive.