It Is Relatively Easy to Pull an Electron Away from a Potassium

Multiple Choice

It is relatively easy to pull an electron away from a potassium atom (K, atomic number 19) , but very difficult to remove a second one because ________.

A) of the repulsions occurring between electrons within the same shell
B) the electrons are so very small
C) of a much greater effective nuclear charge
D) very little energy remains after the first electron is removed