Who among the following is NOT a part of the committee, which is constructed to provide suggestions to the Prime Minister regarding the appointment of a chief commissioner of Central Information Commission?

Speaker of the Lok Sabha

The correct answer is Option 1 - Speaker of the Lok Sabha

Speaker of the Lok Sabha is not part of the committee that recommends the Chief Information Commissioner.
The committee recommending the Chief Information Commissioner consists of:

Prime Minister (Chairperson)
Leader of Opposition in the Lok Sabha
A Union Cabinet Minister nominated by the Prime Minister