Task: Question Answering
Input (English): Question: In a Quiz the points in each round for the first,second and third were 1000,50,20 . No other points were given. Sam participated in several rounds in the competition and the product of his score was 50000. In How many rounds did he participate?

 Option A: Cannot be determined

 Option B: 43

 Option C: 3

 Option D: 6

 Option E: 10
Output (English): Option A