Answer:
A. 0
What is the Explanation?
Since we are doing 25 % 5, we are trying to figure out the last time number 2 fits into number 1. Therefore, 5 fits into 25 pefectly. Let me give you another example, if it was 7 % 4 the answer would be 3 because 4 can fit once, then when it tries to fit another time it can only put 3 into the 7.
Hope that helps.