Aside from the improbability of his story, the other evidence that Gatsby is lying when he tells Nick about his background is the way Gatsby acts about it when it is brought up.
He obviously doesn't want to talk about his past a lot, and it seems that he is hiding something. This is why Nick doesn't completely believe what Gatsby has to say because there is a lot of dissonance between his story and his actual behavior about it.
The answer to your question is the first option, take pride in being a human being.
D. A Medieval Ruin.
Hope this helped :)
p.s. i need one more brainliest to rank up ;)
Alliteration
C is used a lot
