The short answer is natural sciences. The longer answer is that he studied under M. Waldman and M. Krempe and the subjects he excelled included biology, early genetics, Galvinism, electricity and pseudo-genetic engineering. All of these subjects are what helped Victor create the Monster.
He offers Nick part in a business that he does on the side line in which he would a great deal of money
Nick now realized that Gatsby was not used to people doing favors for him without requesting something in return he also realized that Gatsby was lonely and did not have true friends
Turning some hyphens into semi colons i believe
The best answer is B.
This choice clearly and specifically defines why the speaker is both relieved and regretful. The other options are a bit vague and do not directly relate to the idea of learning to be responsible about money.