What about Gatsby causes this disillusionment

Explanation: The Great Gatsby, Nick is disillusioned with mankind because of their shallow and "shortwinded elations." In contrast, Gatsby lives with an eternal sense of hope, always believing that his dreams were on the verge of being realized, and everything he did was focused on a singular, hopeful goal.

ich statement best shows a problem in travels with charley?

one sharp difficulty presented itself. in the intervening twenty-five years my name had become reasonably well known.

this being so, my trip demanded that i leave my name and my identity at home.

i had to go alone and i had to be self-contained, a kind of casual turtle carrying his house on his back.

with all this in mind i wrote to the head office of a great corporation which manufactures trucks.

an expression designed to call something to mind without mentioning it explicitly; an indirect or passing reference.