How do Gatsby's claims about his time at Oxford, his medals for his service in the war, and his time living "like a young rajah in all the capitals of Europe" affect Nick?

AThey make Nick feel as though Gatsby is lying, and he dislikes him.
BThey make Nick feel threatened because he knows he cannot trust Gatsby.
CThey confuse Nick because he already knows the truth about Gatsby.
DThey impress Nick, who envies Gatsby's adventurous and eventful past.

F. Scott Fitzgerald's novel "The Great Gatsby" tells the story of not the narrator Nick Carraway but rather his neighbor Jay Gatsby. Though the story is told from the perspective of Nick, we also get a detailed account of the numerous characters in the story.

In Chapter IV of the story, we see Nick and Jay in conversation about his past, how he had managed to become the man he is today. Along the car ride, Gatsby tells him his upbringing and how he had come with such wealth. Though at first Nick seem to find it hard to believe, when Gatsby produced the slug and the photo from his days in the army, Nick seemed to accept the tale as the truth.

Particularly interesting is Gatsby's claim of having been from Oxford and his medals from service during the war, and more significantly the claim that he was "like a young rajah in all the capitals of Europe" all made Nick find it hardly probable. He had to suppress a laughter after hearing all these claims from Jay.