Step 1: Understanding the Question
The question asks which authority has the power to inquire into and decide on disputes and doubts concerning the election of the President of India.
Step 2: Constitutional Provision
Article 71(1) of the Indian Constitution is very clear on this matter. It states:
"All doubts and disputes arising out of or in connection with the election of a President or Vice-President shall be inquired into and decided by the Supreme Court whose decision shall be final."
Step 3: Evaluating the Options
(A) All the High Courts: High Courts do not have jurisdiction over presidential election disputes.
(B) Election Commission of India: The ECI conducts the election, but it does not have the judicial power to adjudicate disputes arising from it.
(C) Parliament: Parliament makes laws regarding the election but does not act as a court to settle disputes.
(D) Supreme Court of India: As per Article 71, the Supreme Court has the exclusive and final jurisdiction to decide on disputes related to the elections of the President and Vice-President.
Step 4: Final Answer
The Supreme Court of India is the sole authority to decide disputes relating to the election of the President. Therefore, option (D) is the correct answer.