Which one of the following groups belongs to the same school of thought?

• A. J.J. Rousseau, M. Robespierre, N. Bonaparte, O. Cromwell
• B. T. Jefferson, J. Madison, G. Washington, Abraham Lincoln
• C. F. Engels, K. Marz, M. Bakunin, J. S. Mill
• D. Georgi Plekhanov, Vera Zasulich, Alexandra Kollontai, V. I. Lenin