The correct answers are A) Populist and C) Social Intellectuals.
The main two revolutionary parties that first wanted to overthrow the Russian government before 1905 were the Populist and Social Intellectuals.
In those difficult years before 1905, there were two groups or factions that were interest in a major change of government in Russia. In that time, the Tsar used to have all the control and oppressed the people. So the Populist and the Social Intellectuals aspired to a better form of government that really took care of the people. In that time, people were worried about the consequences of Industrialization in affecting human values and the cultural changes in society.