The maximum number of members in a State Legislative Assembly is 500. This is as per the 73rd Amendment to the Constitution of India, which was passed in 1992. The amendment also provides that the number of seats in a State Legislative Assembly shall be determined by the Delimitation Commission, which is appointed by the President of India. The Delimitation Commission takes into account the population of the state, the number of seats in the Lok Sabha from the state, and the number of seats in the Rajya Sabha from the state, while determining the number of seats in the State Legislative Assembly.
The option A, 350, is incorrect because the maximum number of members in a State Legislative Assembly is 500.
The option B, 600, is incorrect because the maximum number of members in a State Legislative Assembly is 500.
The option C, 500, is the correct answer because it is the maximum number of members in a State Legislative Assembly as per the 73rd Amendment to the Constitution of India.
The option D, 750, is incorrect because the maximum number of members in a State Legislative Assembly is 500.