Step 1: Defining the Indian Constitution's Secularism.
The Indian Constitution's Preamble establishes India as a secular state. This means the government does not endorse any specific religion and treats all faiths equally.
Step 2: Evaluating the Options.
- (1) Fundamental Duties: While promoting religious respect, they don't explicitly declare secularism.
- (2) The Preamble: It directly states India is secular, affirming secular principles.
- (3) Directive Principles: These are governmental guidelines, not a direct statement on secularism.
- (4) Article 75: This article concerns the Council of Ministers, not secularism.
Step 3: Conclusion.
Therefore, (2) The Preamble is the correct answer because it explicitly defines India as a secular republic.