Step 1: Understanding Article 145(3).
Article 145(3) of the Indian Constitution specifies the minimum number of judges required for deciding cases involving substantial questions of law or references under Article 143. It mandates that at least five judges are required to hear such cases.
Step 2: Explanation of the options.
- (a) Two: This is incorrect as two judges are not sufficient for cases involving substantial questions of law.
- (b) Three: This is incorrect; five judges are required, not three.
- (c) Five: This is the correct answer, as per Article 145(3), five judges are required for such cases.
- (d) Nine: This is incorrect as Article 145(3) only requires a minimum of five judges.
Step 3: Conclusion.
Thus, the correct answer is (c) Five.