A dispute regarding the election of the President is referred to the:

Correct option is C

According to Article 71 of the Indian Constitution, all doubts and disputes arising out of or in connection with the election of the President or Vice-President are to be inquired into and decided by the Supreme Court, whose decision is final.
Key Points:
Only the Supreme Court has the exclusive jurisdiction to hear such matters.
If the election is declared void by the Supreme Court, the President must vacate the office.
This mechanism ensures judicial review and fairness in the electoral process.