The correct answer is option 4 - the workers. Socialism is a socio-economic system where the means of production, distribution, and exchange are owned and controlled by the workers or the working class. It aims to create a society that is more equitable, where wealth and resources are shared collectively rather than being concentrated in the hands of a few individuals. The workers are the primary beneficiaries of socialism as it seeks to address the class struggle and improve their living conditions. While intellectuals, the poor, and the middle class can support socialist principles and policies, they are not the driving force behind the movement. The workers, who are often disadvantaged and exploited by capitalism, are the central focus of socialism.