MALCOLM. This murderous shaft that's shot

Hath not yet lighted, and our safest way

Is to avoid the aim. Therefore, to horse,

And let us not be dainty of leave-taking,

But shift away. There's warrant in that theft

Which steals itself when there's no mercy left.

-William Shakespeare, Macbeth, Act II, scene iii

What frightens Malcolm and Donalbain into fleeing Scotland?

A. They fear they will be branded traitors.

B. They think they will be suspected of the crime

C. They believe someone will try to murder them, too

D. They witness Macbeth killing their father.