In the great gatsby chapter 4 what is the purpose of the first section

Chapter 4 concerns itself largely with the mysterious question of Gatsby’s past. Gatsby’s description of his background to Nick is a daunting puzzle—though he rattles off a seemingly far-fetched account of his grand upbringing and heroic exploits, he produces what appears to be proof of his story

Explanation:

b) sending meeting reports

hope this

if you want you can give me brainiliest i need 3 more but your choice

                  ~jayden

b. failure at least that one seems the most negative out of all of the answers provided pls correct me if i'm wrong. : ))