Which of the following grounds is necessary to be proved in order to remove a speaker of any Legislative Assembly;

The correct answer is D. None of the above.
While a Speaker can be removed from office via a resolution passed by the Legislative Assembly, there isn't a specific legal requirement to prove any particular grounds like "misbehaviour," "incapacity," or "conduct involving moral turpitude" to remove them. The process is essentially based on a majority vote of the Assembly members deciding they no longer want the current Speaker in office.
Explanation:

• No explicit legal definition: The Indian Constitution doesn't explicitly outline the grounds for removing a Speaker, leaving the process open to interpretation by the legislative body.
• Majority vote is key: The key factor is a majority vote of the members of the Legislative Assembly voting to remove the Speaker.
• Potential for political considerations: Since the removal is based on a political vote, the reasons for removal might not be strictly defined by legal criteria but rather by the political dynamics within the house.