Answer:
Gatsby does not actually offer Nick a job, but suggests that he could help him out financially through his vast network of business connections. Nick resents and declines this offer of assistance because he knows Gatsby is only offering to reward him for enabling him to meet with Daisy and for them to use Nick’s little cottage as a place for further meetings
Explanation:
Two things to keep in mind when you're deciding whether to use formal or informal English are the B) occasion and the audience.
Of course you are going to change the way you talk depending on whether you are speaking to your friends or to your teacher - usually with the teacher you are going to use more formal English.
Occasion is also important - you won't speak in the same manner at a party and a cocktail.
