Answer: This could be all the above...
Explanation: Ethos or the ethical appeal, means to convince an audience of the author's credibility or character. Pathos or the emotional appeal, means to persuade an audience by appealing to their emotions. ... Logos or the appeal to logic, means to convince an audience by use of logic or reason.
Sentence 4 because it summarizes the paragraph but does not give an opinion like answer but used factual evidence to support it.
That everyone goes to Gatsby's parties, just to enjoy.
