In which case the Supreme Court held that the Preamble does form part of the Constitution?

Correct option is C

In the landmark case of Keshavananda Bharti v. State of Kerala (1973), the Supreme Court held that the Preamble is an integral part of the Constitution. The judgment clarified that while the Preamble is not a source of power or limitations, it plays a key role in the interpretation of statutes and provisions of the Constitution, especially when any ambiguity arises.
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Information Booster:
The Berubari Union case (1960) earlier held that the Preamble is not part of the Constitution.
This was overruled by the Keshavananda Bharti case, which introduced the Basic Structure Doctrine and gave constitutional status to the Preamble.
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Additional Information:
The Preamble reflects the ideals and aspirations of the people and lays down the foundational principles of the Constitution—sovereignty, socialism, secularism, democracy, and republic.