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This question could also be rephrased:

Which of the isomers, A) through D), will show in its 1H-NMR spectrum only 2 signals of equal intensity?

By stating the problem in these terms it becomes accessible to the procedure that you have already applied repeatedly:
  1. Predict the number of expected resonance signals by determining the number of equivalent protons for all the isomers A) through D).
  2. Determine the relative intenstities based on the number of equivalent protons contributing to each of the signals of the isomers.
And finally, of course,
  1. Compare your predictions for the different isomers with the experimental data!
When you are done, continue here!