The correct answer is A. While C might be valied, you should consider that interstates not only connect cities from the east to the west, but also from the south to the north and viceversa. The reason why A is the correct one is because interstates were supposed to make easier the transportation of workers and goods, and that would benefit both large cities commercially
A compromise is people working together to meet half way in a decision so if that is successful then i believe it to be an accommodation as it is a compromise itself is an accommodation.
