What makes the great gatsby a classic novel? why has it maintained its place in american literature?

The Great Gatsby by F. Scott Fitzgerald is a classic novel because it portrays in a brutally honest way how the human nature is fuelled by egoism and  the need of constant validation. It also describes many socio-historical aspects of the United States in the 1920s: the development of the mass media, such as radio and tv; the mafia and the illegal activities; etc.

It has mantained a place in American literature for the quality of its content. It represents perfectly how the so-called and so-eager 'American Dream' is just a scam. Yes, Jay Gatsby did manage to earn money, power, a great house, but these things did not grant him real happiness: he did not have any real friends, people just pretended to like him for his position, and he was not loved back by Daisy. 

B. alice is pretending there is a way through the glass when in reality that would not be physically possible therefore she has to pretend. but i think d is also possible because alice notices the glass is actually melting away which is also not possible either