“The State shall not discriminate against any citizen on grounds only of religion, race, caste, sex, place of birth or any of them”. This has been incorporated in:

Article 15

The correct answer is Option 3 - Article 15

Prohibition of discrimination: Article 15(1) states that the State shall not discriminate against any citizen on grounds only of religion, race, caste, sex, place of birth, or any of them. This means that the State cannot treat citizens unequally or unfairly based solely on these characteristics.
The prohibition against discrimination applies to various aspects of public life, including access to public places, shops, public restaurants, hotels, and places of public entertainment. It also applies to the use of wells, tanks, bathing ghats, roads, and places of public resort maintained wholly or partly out of State funds or dedicated to the use of the general public.