Answer:
d. Hexagon Inc. cannot be challenged in a court even when it fails to follow up on its promises.
It's important because if you were to get used to doing "something wrong", you might as well go into the habit until you get caught. Besides, it's best to do the right thing.
Answer:
By paying user charges in the form of lock fees and fuel taxes.
Explanation:
The water carriers in repaying the government for the water way construction aid received do this by paying user charges in the form of lock fees and fuel taxes.