The personal problem that Milton examined in his poem Lycidas is how to deal with the loss of loved ones.
He wrote in that poem about his best friend who died, so it is a sort of a manual on how to get over your grief as well. It is an ode to his best friend whom he lost and couldn't forget, so he decided to commemorate him in a poem and thus he will live forever through art.
I think someone is knocking at the door
Answer:
yes it is and it means to continue
and it has a mystery meaning
A seems the most logical in this sense, since parents are portrayed (and majority do) sacrifice a lot so their children can live good and better lives than they did.
