The correct answer is option 4: Article 348 of the Constitution of India.

Under Article 348, it is prescribed that all proceedings in the Supreme Court of India shall be conducted in the English language. This provision of the Constitution establishes English as the official language of the Supreme Court.

Option 1, The Supreme Court Rules, 1966, does not specifically prescribe the use of English as the language of proceedings in the Supreme Court. The Supreme Court Rules mainly deal with the internal functioning and administration of the court.

Option 2, A Legislation made by the Parliament, is a broad statement and does not specifically address the language of proceedings in the Supreme Court.

Option 3, Article 145 of the Constitution of India, empowers the Supreme Court to make its own rules for regulating the practice and procedure of the court, but it does not directly address the language to be used in the proceedings.

In conclusion, option 4 is the correct answer as it directly refers to the provision in the Indian Constitution that mandates the use of English in the Supreme Court.