In a Quiz the points in each round for the first,second,third and fourth position were 100,50,20,10 ...

In a Quiz the points in each round for the first,second,third and fourth position were 100,50,20,10 . No other points were given. Rachel participated in several rounds in the competition and the product of her score was 10000. In How many rounds did she participate?

Quiz

Answer/Solution

Cannot be determined

Steps/Work

Correct answer is B because we are given that there won't be any points awarded for rounds other than 1st four position.
Thus, it may happen that she played 150 rounds out of only 8 rounds were there in which she was awarded some points.