Which Should Be Larger,the Potassium Atom,K,or the Potassium Ion,K⁺

Multiple Choice

Which should be larger,the potassium atom,K,or the potassium ion,K⁺?

A) The potassium ion,K⁺ is larger since charging an atom always makes it larger.
B) The potassium atom,K,with an additional shell of electrons is larger.
C) The potassium ion,K⁺ is larger since it has an extra electron which increases its size.
D) The potassium atom and the potassium ion are exactly the same size and only differ in charge.