Explanation:

Let’s break it down:

- The election for the next Vice-President needs good timing for continuity and smooth governance.

- According to Article 68(1) of the Indian Constitution, the election has to be held before the expiry of the outgoing Vice-President's term.

- Specifically, the election must be completed within 60 days of the office becoming vacant to prevent a leadership vacuum.

- Here’s a look at your options:

- Option 1: 75 days — Not correct, it’s too long.

- Option 2: 60 days — This nails it. The Constitution says 60 days.

- Option 3: 90 days — That drags it out, not as per rules.

- Option 4: 120 days — Way too much time, not constitutional.

So, Option 2 is the right pick.