The narrator is Reliable because he willingly relates details of his breakdown into insanity
The answer is for instance. This is the answer because the term "for instance" is sometimes used to give an example. In the paragraph, for instance is used to give an example of how cuckoos mimic other animals.
I'm pretty sure the answer is D. Grammar is not important at this phase. I hope this helps! And i'm sorry if i'm wrong. :)
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