Which Article of the Indian Constitution mentions about the salaries and allowances of members of the Legislative Assembly and the Legislative Council of a state?

The correct answer is Article 195.

Here is a step-by-step explanation of the relevant provisions of the Constitution of India regarding the salaries and allowances of members of the State Legislature:
1. Article 195: This Article specifically deals with the salaries and allowances of the members of the Legislative Assembly and the Legislative Council of a State. It states that members of the Legislative Assembly and the Legislative Council of a State shall be entitled to receive such salaries and allowances as may from time to time be determined by the Legislature of the State by law.
2. Article 194: This Article deals with the powers, privileges, and immunities of State Legislatures and their members and committees.
3. Article 198: This Article prescribes the special procedure in respect of Money Bills in the State Legislature.
4. Article 199: This Article defines what constitutes a "Money Bill" in the context of the State Legislature.

Therefore, Article 195 is the correct constitutional provision that governs the salaries and allowances of the members of the Legislative Assembly and the Legislative Council of a State.