Detailed Solution:
The correct answer is “(a), (b) and (c) all read together”.
1) Article 14 provides for equality before the law and equal protection of the laws, which forms the basis for ensuring equal treatment and fairness.
2) Article 16 ensures equality of opportunity in public employment and mandates that no citizen should be discriminated against in matters of public employment on grounds only of religion, race, caste, sex, or place of birth.
3) The word "socialist" in the Preamble reflects the objective of the Constitution to achieve social and economic justice and can support the interpretation of fundamental rights in a way that promotes social welfare.