What change occurred in socialist ideas with the formation of communist parties?

Correct answer: They began to turn into organised political programmes

Before the formation of communist parties, socialist ideas could exist mainly as theories, criticisms of society, or proposals for an ideal future. Party formation gave these ideas an organised political form. Parties defined objectives, prepared programmes, recruited members, educated supporters, developed leadership, and planned collective action to seek power or social change. Thus socialism moved from discussion alone towards institutions capable of mobilising workers and contesting governments. Option C is correct because it describes this transformation from ideas into organised political programmes. Options A, B, and D are incorrect: the ideas did not remain imaginary, become monarchist, or turn into feudal law.