A. is a good way to save fuel
B. may impede other vehicles on the road that are traveling at normal and safe speeds
C. cannot result in a ticket for driving too slowly
D. Both B and C
B. of course. Remember that normal and safe speeds are not more than the posted limit and can be much less in bad conditions. Even 75 mph freeways drop to 25 mph or less when they are icy.
If you are not driving the speed limit you are in the way.
E. Is best done in the far right lane.