Answer:
B. P=10 E=8 N=10, C. P=20 E=18 N=18
Explanation:
(P=protons, E=electrons, N=neutrons)
Protons have a positive charge while electrons have a negative charge.
If you have 2 more protons than electrons then the charge would be +2.
If you have 2 more electrons than protons then the charge would be -2.
Neutrons do not have a charge, they don't affect the overall charge.