b and c can't be right since reviewing doesn't=timeliness, and they are already writing about a topic. D is a little more tricky, but you can't use information from peers as source material, as it is hard to identify whether what he/she is saying is true. and so A must be true.
We can assume Macbeth is feeling the emotion of "guilt" based on his vision of Banquo's ghost, since the ghost reminds him that he is responsible for the death.
