Answer:
The novel details two days in the life of 16-year-old Holden Caulfield after he has been expelled from prep school. Confused and disillusioned, Holden searches for truth and rails against the “phoniness” of the adult world. He ends up exhausted and emotionally unstable. The events are related after the fact.
Explanation:
The third option is correct: "Art and math are courses architecture students must have on their schedules."
The other two uses the word "their" when referring to a single thing/person. The correct word should be: "Each architecture student must plan his/her high school and college courses carefully." and "Every school of architecture sets its own specific requirements."
When Gregor died, he was transformed into a big insect. From then on, the story continues. Gregor had not realized that he was dead. They were so dependent on him. His passing had changed the way they looked at life. They were able to get jobs and the same time learned to use money wisely. They were able to save some of Gregor's saving and from their father's failed business.