Donovan is going to add many numbers. each number will use only the digit 1. what is the greatest number of addends donovan can use without having to regroup? explain.

I’m guessing that the answer is c, but i’m not sure which grid is being talked about. since 5x5= 25 and 3x3= 9 (which there are no answers for). a is not right because while the ratio is the same, 6/25= 0.24 which is equal to 24% not 30%.