3/8 + 3/5 = <u>39/40</u> and 39/40 Can't be <em>simplified</em>
Your answer is c
Hope this helps :)
Basically divide each fraction to get the simplified version of each answer. You divide each fraction by the highest multiple.
4/16 can be divided by 4 to get 1/4
12/18 can be divided by 6 to get 2/3
4/10 can be divided by 2 to get 2/5
16/20 can be divided by 4 to get 4/5