Biology- biological molecules question

Hi please could i have help on this question? I’m not sure how to do it?
Here is the question: https://app.gemoo.com/share/image-annotation/604195630637142016?codeId=MlQZ3JGWeq9QY&origin=imageurlgenerator

Thank you!

First note that the mass after just boiling with Benedict doesn't matter. It's the difference in mass that matters. A non-reducing sugar will only be converted to a reducing sugar after hydrolysis with acid and boiled with Benedict's. The answer is B because out of all the other portions 45-30 = 15g, gives us the biggest positive change in mass. This shows the amount of copper oxide before and after hydrolysis. It mentions that the amount of copper oxide present is proportional to the mass of reducing sugar present. The greater the mass of copper oxide made, the more non-reducing sugar is converted to reducing sugar.