Explanation:

- Article 55: This Article explains the manner of election of the President of India. It lays down the process of proportional representation using a single transferable vote and ensures uniformity in representation.

- Article 51: This Article is about promoting international peace and security. It is not relevant to the election of the President.

- Article 61: This Article deals with the procedure for the impeachment of the President, not the election.

- Article 65: This Article outlines the duties of the Vice President when the President is unable to perform their duties, not about the election.

Correct Answer: Option 1, Article 55