I think the city should choose option B and plow the residential streets more faster.
In my street, after big snowfall the plow come only after two days. During this time it is very hard to drive. Last winter my car was stuck in front of my house and my neighbour and me had to push it. I was late to work two times because of this problem. Many people in my area use car for go to work, because the bus is not close.
Also, it is important for safety. If the street is full of snow, ambulance or fire truck can't come quickly when there is emergency. This is very dangerous, specially for old people.
I know sidewalks are important too, for people who walk or take the bus. But I think people can walk on the snow more easy than a car can drive. So for me option B is better choice for our city.