No, they do not have to be written by a historian.
D, because the other options are constant change.
Gabriels tears are generous because until that moment he had been egoistic and distracted toward Gretta. When he became conscious of that fault, he release his generosity in a pity crying.
It depends. It depends on whether there are any fans that are attendant, if any of the players have the virus, and if the players and coaching staff use protective equipment such as masks. Another thing that it depends on is which sport it is. Some sports like context sports for example should not be played due to how close the players are getting to one another. So professional sports probably shouldn’t be played for now. But eventually they should be able to return. :)