B. It shows it in the present tense and are shows a general group, not a specific individual.
Locke is trying to say that tyranny is the exercise of power for the wrong reason, basically meaning that it is abusing ones power over someone or something
C. The angels arrogant attitude keeps people at a distance; they find his endless bragging to be annoying.
It would be about over a thousand words. An average for 3-4 years olds is a few thousand words.