The correct answer is Option 4: the Right to Equality.

Article 15 of the Constitution of India guarantees the right to prohibition of discrimination on grounds of religion, race, caste, sex, or place of birth. This article falls under the Right to Equality, which is enshrined in Articles 14 to 18 of the Indian Constitution.

The Right to Equality is a fundamental right that ensures equal treatment and protection of all individuals under the law. It prohibits discrimination and promotes the principles of equal opportunity and non-discrimination. Article 15 specifically addresses discrimination on the basis of religion, among other grounds.

The Indian Constitution recognizes the importance of maintaining a secular and egalitarian society. It seeks to eliminate social, economic, and political inequalities and promote equal status and opportunities for all citizens. Article 15 plays a crucial role in achieving this objective by prohibiting discrimination based on religion, which is a fundamental aspect of a person`s identity and belief system.

It is important to note that while Article 15 ensures the right to prohibition of discrimination on grounds of religion, it does not confer any positive right to practice or propagate religion. The right to freedom of religion, which is enshrined in Article 25 to 28 of the Constitution, grants individuals the freedom to profess, practice, and propagate their religion subject to certain limitations. These rights are separate and distinct from the right to equality and are classified under the Right to Freedom of Religion.

In conclusion, Article 15 of the Constitution of India, which guarantees the right to prohibition of discrimination on grounds of religion, etc., falls under the Right to Equality. It is a fundamental right aimed at ensuring equal treatment and non-discrimination for all individuals, regardless of their religious beliefs.