What affect did Julius Caesar's seizure of power have on the Roman political system?

its clearly C. the first two answers are wrong because Julius Caesar came to power through war and publicity, placing himself as a dictator for six months, and then for life. This would revoke much of the Senate's powers, and this effect would have nothing to do on the rights of commoners versus nobles. D. is clearly wrong because there really is no standard system for how the emperor was chosen, and his way of getting power was through killing all his enemies, which was not the "standard" way (though did happen often).