The bloodshed in July declared that the regime completely fell into the hands of the bourgeois provisional government, and the coexistence of the two regimes ended, thus the possibility of peaceful development of the revolution disappeared. In view of the change of the situation, Lenin changed his struggle strategy in time and put forward the slogan of "seizing political power", so item C is correct; Items A, B and D are not consistent with the actual situation at that time, so they are excluded.