The correct answer for this question is option 2, Article 348 of the Constitution of India. Article 348 specifically prescribes that all proceedings in the Supreme Court shall be conducted in the English language.

Let`s review the other options to better understand why they are incorrect:

Option 1, Article 145 of the Constitution of India, is incorrect because it addresses the rules for the Supreme Court toadjudicate cases but does not specifically mention the language of proceedings.

Option 3, The Supreme Court Rules, 1966, is not the correct answer because while the rules may provide guidance on various aspects of the court`s functioning, they do not have the authority to prescribe the language of the proceedings.

Option 4, An Act passed by the Parliament, is an incorrect answer because there is no specific Act that determines the language of proceedings in the Supreme Court. It is the Constitution itself that provides the mandate for the use of the English language in the court.

In conclusion, it is Article 348 of the Constitution of India that prescribes that all proceedings in the Supreme Court shall be in the English language.