PLEASE HELP FAST WILL MARK BRAINLIEST
Which element(s) is/are not balanced in this equation?

Pb(NO3)2 + 2KCl -> PbCl2 + KNO3

A.) K
B.) K, N, and O
C.) N amd O
D.) Pb, N, and O
(Even though you don't need the Periodic Table to figure this out, feel free to use it if you think it will help you)