Answer:
Disillusionment is the correct answer.
Step-by-step explanation:
Modernism was a movement during the early 20th Century and it took many values and situations from industrial life. It was also the crossroad between art techniques from 19th Century and new imagery that belonged to the 1900s.
In the excerpt we can see disillusionment after Roger realizes nobody knows or cares about Dan. The semantic field is also related to this feeling through the words "giddy" "terrible time" "stormed out". We can also understand that the character feels lonely, specially at the very end when the narrator says "nobody noticed" after he had left the place.