Refer to the Figure Below

Refer to the figure below. The figure represents a helium atom.What change to this figure would allow it to represent an isotope of hydrogen?

A) Remove one small circle from the outer ring, and remove two unlabeled circles from the center.
B) Remove one small circle from the outer ring, and remove one circle labeled with "+" and two unlabeled circles from the center.
C) Remove one small circle from the outer ring, and change one circle labeled with "+" to an unlabeled circle in the center.
D) Remove one small circle from the outer ring, and change one unlabeled circle to a circle labeled with "+" in the center.
E) Remove one small circle from the outer ring, and add one unlabeled circle to the center.