Which of the Following Statements About the Atom Is True

Which of the following statements about the atom is true?

A) There are usually more protons than electrons in an atom because the negative charge of an electron is larger than the positive charge of a proton.
B) The negative charge of an electron adds mass to an atom without influencing other properties.
C) In an atom with a neutral charge, the number of electrons is equal to the number of protons.
D) The number of electrons determines whether an atom of an element is radioactive.
E) The energy level of electrons is higher in shells close to the nucleus of the atom.