The correct answer is option 3 - 1, 2 and 3.

1. The statement that the office of the Deputy Speaker acquired a more prominent position after the enforcement of the Constitution of India in 1950 is correct. The position of the Deputy Speaker gained more importance with the establishment of the Constitution as it brought about a more structured and democratic functioning of the Lok Sabha, the lower house of the Indian Parliament.

2. The statement that the Deputy Speaker is elected from amongst the members is correct. The Deputy Speaker is chosen by the members of the Lok Sabha through an election process. This ensures that the Deputy Speaker is representative of the members and is accountable to them.

3. The statement that the Deputy Speaker holds office until he/she ceases to be a member of the House is correct. The Deputy Speaker`s term is linked to their membership in the Lok Sabha. If they cease to be a member of the house, their position as Deputy Speaker automatically comes to an end.

In summary, the Deputy Speaker of the Lok Sabha gained significance after the Constitution of India was enforced, is elected from among the members, and holds office as long as they are a member of the House.