Which Article of the Indian constitution states that “The Council of States shall, as soon as may be, choose a member of the Council to be Deputy Chairman thereof and, so often as the office of Deputy Chairman becomes vacant, the Council shall choose another member to be Deputy Chairman thereof.”?

Article 89

The correct answer is Option 2 - Article 89

The Article of the Indian Constitution that states the provision about electing the Deputy Chairman of the Council of States is Article 89.

Here's the specific clause within Article 89 that mentions the selection process:

Clause (2): "The Council of States shall, as soon as may be, choose a member of the Council to be Deputy Chairman thereof and, so often as the office of Deputy Chairman becomes vacant, the Council shall choose another member to be Deputy Chairman thereof."