The correct answer is option 2, Article 16 of the Indian Constitution. Article 16 of the Indian Constitution guarantees equal opportunities for all citizens in matters of public employment. This means that the state cannot discriminate against any citizen in the matters of public employment based on religion, race, caste, sex, descent, place of birth, or residence. It ensures that every citizen has an equal opportunity to be considered for employment in government offices, organizations, and institutions. Under Article 16, the state is also prohibited from imposing any kind of restriction on any citizen in terms of access to public employment opportunities. Therefore, Article 16 plays a vital role in ensuring equality and fairness in the recruitment and selection processes of the public sector in India.