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.
What motivates Odysseus to ... He lies to the cyclops and says his name is no one so that when he ... so they thing that nothing has happened to him and don't realize the .... A) Odysseus knows that Poseidon is the Cyclops' father.
