What Is the Correct Assignment of the Number of Signals

Multiple Choice

What is the correct assignment of the number of signals in the ¹³C NMR spectra of the following disubstituted benzene derivatives?

A) I = 3 signals; II = 3 signals; III = 2 signals
B) I = 3 signals; II = 4 signals; III = 2 signals
C) I = 6 signals; II = 6 signals; III = 6 signals
D) I = 3 signals; II = 4 signals; III = 3 signals