Option 1: Social Security Scheme - Socialism is not opposed to social security schemes. In fact, socialists often support and advocate for social welfare programs and safety nets to ensure that all members of society have access to essential services and support.

Option 2: Equal Distribution of Wealth - This is a key principle of socialism. Socialism aims to reduce inequality by advocating for the equal distribution of wealth and resources among all members of society. Therefore, socialism is not opposed to equal distribution of wealth.

Option 3: Unrestricted Competition - The correct answer. Socialism is indeed opposed to unrestricted competition. Socialists argue that unrestricted competition can lead to exploitation, inequality, and an uneven distribution of resources. Instead, they advocate for regulated markets and a more cooperative and planned economy.

Option 4: Collective Ownership and Management - This option is actually a characteristic of socialism, not something that socialism is opposed to. Socialists believe in collective ownership and management of resources and industries, as opposed to private ownership and control. Therefore, socialism is in favor of collective ownership and management.

Overall, the correct answer is option 3.