The correct answer is: C. 50 percent strength of the Lok Sabha
The Lok Sabha is the lower house of the Indian Parliament. The minimum number of members that must be present to hold the meeting of the Lok Sabha is 50 percent of the total strength of the Lok Sabha. This is as per Article 108 of the Constitution of India.
Option A is incorrect because it is the minimum number of members required to form a quorum in the Rajya Sabha, the upper house of the Indian Parliament.
Option B is incorrect because it is the minimum number of members required to form a quorum in a state legislative assembly.
Option D is incorrect because it is not a specific number. The minimum number of members required to hold a meeting of the Lok Sabha can be more than 100, depending on the total strength of the Lok Sabha.