Which of the Following Statements Is Not Correct When Balancing

Multiple Choice

Which of the following statements is not correct when balancing a nuclear equation? I.The mass numbers must be conserved on both sides of the reaction arrow.
II.The ionic charges must be conserved on both sides of the reaction arrow.
III.The atomic numbers must be conserved on both sides of the reaction arrow.
IV.The elements must be the same on both sides of the reaction arrow.

A) II only
B) II and III
C) I and III
D) II and IV