Answer:
The answer is D. Where we are,/ There's daggers in men's smiles: the near in blood, / The nearer bloody.
In this line in Macbeth (Act II, Scene III), Donalbain tells Malcolm that wherever they go, people will smile at them while having knives (daggers) hidden. He also states during the same conversation that even their closest relatives represent a threat and could murder them. Malcolm and him realize that they are in danger and they need to flee Scotland.