How does the alliteration add to the urgent mood in this excerpt?

A; by showing that Banquo is happy that Fleance will stay free because he has run away
B: by showing that Banquo thinks that Fleance has run away because he is a coward
C: by emphasizing that Banquo believes that Fleance is a traitor and should be avoided
D: by emphasizing that Banquo wants Fleance to run away and find who planned his murder