Answer: A. Frederico raised the most money.
Explanation:
The easiest way to look at it is to convert the fractions into decimals.
1. 6/7 = .857
2. 5/9 = .3 repeating
3. 11/10 = 1.1
So, when it is put into decimals it is easier to understand who raised the most money (Frederico).
Hope this helps :)