G. high-sounding interpretation can be put upon them but because
they are useful
Chaucer uses a lot of Irony in his small story's.
No. The comma isn’t necessary; therefore , it should be removed from the sentence.
He lied to him because he knew that the Cyclops would call his brothers, when blinded, so he said his name was "nobody" so as to have the Cyclops yell out: "Nobody has blinded me". This in turn caused his brothers to not react at all, because they thought that gods had blinded his brother, therefore he is yelling that Nobody blinded him. Let's say then that the third sentence is the only one that can fit the story.