Marianne is a professional chess player who hums audibly while playing her matches, thereby distracting her opponents.
Conclusion (therefore / should)
I shouldn't be held responsible for my humming.
Intermediate Conclusion
My humming is involuntary.
Premise (since)
I was unaware I was humming.
Evaluate
We're trying to support a conclusion that says "should not be held responsible for X", so we'll need an answer choice set up like, .
The author's reason for not thinking she should be held responsible is that she was unaware she was humming and thus the humming was involuntary.
Goal
We would anticipate potential correct answers like,
If unaware of X → not responsible for X
or like
If X is involuntary → not responsible for X