Social equality refers to the notion that no person should be subjected to a position of relative inferiority based on factors such as caste, race, or religion in comparison to others. It emphasizes the need for equal treatment, opportunities, and rights for all individuals, regardless of their social background.

Option 1 is incorrect as it suggests that individuals should perform functions based on their status, which goes against the principle of social equality. This option implies a hierarchical system where certain individuals are privileged over others.

Option 2 is also incorrect as it suggests that no effort should be made to modify the existing social system. Social equality involves striving towards a fair and just society, often necessitating the modification or elimination of discriminatory elements within the social system.

Option 4 is partially correct as it reflects the special effort to improve the conditions of weaker sections. However, it does not capture the broader concept of social equality, which encompasses the elimination of all forms of relative inferiority among individuals.

Therefore, option 3 is the correct answer as it accurately defines social equality, emphasizing the importance of ensuring no individual is subjected to a position of relative inferiority in comparison to others based on caste, race, or religion.