Yes it is an hero because he help them
I am pretty sure that description above belongs to Nancy Lammeter. I choose this option because, as far as I remember, both Silas Marner and Dunstan Cass are morally-weakers. What about Godfrey Cass - he is just opposite to Dunstan which does not concides with the description. I think it's clear, regards!
I believe the answer is B. Nguyen explains how buses reduce traffic by lowering the number of cars on the road.
The passage says “Clearly, buses reduce traffic rather than cause it”. Answer B is the only answer that mentions traffic in a logical way.
I hope this helps!