In which town The Supreme Court was established for the First time under the Regulating Act of 1773?

Calcutta

The correct answer is Option 3 - Calcutta

The Supreme Court established under the Regulating Act of 1773 was in Calcutta, which is now known as Kolkata.

The Act established the Supreme Court of Judicature at Fort William in Calcutta, which served as the highest court in British India until 1862.