Answer:
C. I've had such a tough life, and I'm so angry about it that I don't care what I do anymore.
Step-by-step explanation:
In Shakespeare's "Macbeth," the second murderer tells Macbeth and the other murderer that he has been so annoyed by his terrible life that he does not care what he does to revenge himself. Thus, he acknowledges he is a substandard man, as Macbeth has told them that killing Banquo would raise them over the common rank.