Which passage from grendel best illustrates the theme "life is meaningless"?

After a thorough research, there exists a question that has the following choices.

A) All order, I've come to understand, is theoretical, unreal -- a harmless, sensible, smiling mask men slide between the two great, dark realities. 
B) I seize up a sleeping man, tear at him hungrily, bite through his bone-locks and suck hot, slippery blood.
C) Fate often enough will spare a man if his courage holds. (162)
D) As if casually, in plain sight of them all, I bit his head off, crunched through the helmet and skull with my teeth and, blood-slippery body in two hands. (79)

The correct answer is letter A) All order, I've come to understand, is theoretical, unreal -- a harmless, sensible, smiling mask men slide between the two great, dark realities.