Hello.
One literary device, which is more often associated as a philosophical device, is the dialectic<span>. This involves the discussion of a concept and its opposite. Another way of thinking of it is that dialectic involves a contradiction (X and its opposite) and a possible solution, balance, or synthesis (combination of X and its opposite)
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The correct answer should be For oft, when on my couch I lie, because the most grammatically correct way to say this would be Often, when i lie on my couch.
Knowing the definition of the bolded word, feebly, helps you understand that C. the speaker is very nervous.