Why did the spread of socialism become an ideological challenge for capitalist societies?

Correct answer: Because socialism questioned private capital and inequality

The direct answer is A: socialism questioned private capital and inequality. To understand this from the beginning, capitalism is an economic system in which private people or companies own property, factories, and capital, while workers usually sell their labour for wages. Socialism argued that wealth and productive resources should serve society more fairly, because private ownership could allow a small group to control wealth and benefit from workers' labour. The reasoning is: private capital can create unequal ownership; unequal ownership can create unequal power and living conditions; socialism criticised this exploitation and demanded greater equality. Option A is correct because it states this central challenge. Option B is wrong because socialism did not declare capitalists to be kings; it criticised the concentration of their economic power. Option C is wrong because socialist movements generally demanded better worker rights, not their abolition. Option D is wrong because giving religious recognition to colonialism is unrelated to socialism's criticism of exploitation and imperial domination. Memory cue: socialism questions who owns wealth and whether its benefits are distributed fairly.