For question 2, could it also be

/Railroad serves its customers well -> unsuccessful business

/unsuccessful business -> serves customer well?

I am having difficulties determining the importance of the negate symbol when the words essential mean the same thing. Does this mean they are equivalent and both correct? Or is the form that uses primarily "Lawgic" correct?

Interested!

I was very stuck between A, D and E. Ultimately had to just guess. I had to outweigh the assumptions, but interested in skills in building skills in understanding the assumptions and finding the best and most sensible ones.