The answer for the first question is A) The dark atmosphere shows that public schools have been victims of destructive weather events. We can observe that the school has been tore apart and its barely standing still, most likely due to the destructive weather event that just took place in the scenario.
For the second question, I believe the answer is C) He compares the colonies to pieces of snake because he believes colonies will be innefective unless they work together. His belief is not only representated by the snake but also by the slogan he chose 'Join or Die' which allows us to understand that unless the colonies unite they are not effective.
'Epitaph on a Tyrant', like many of Auden's poems of the 1930s, was inspired by the appalling events of that decade, but it also neatly encapsulates the qualities and behaviour of all tyrants, from Herod to Henry VIII to Hitler.