Answer:
No. 1:
A. His parties are lavish and extravagant
No. 2:
B. To add more mystery about Gatsby’s character
No. 3:
C. Sometimes they came and went without having met Gatsby at all, came for the party with a simplicity of heart that was its own ticket of admission.
Explanation:
What the readers can infer from this description of Gatsby’s parties is that "his parties are lavish and extravagant". The author describes the atmosphere to be elegant and extravagant. There's lots of music and dancing. It tends to symbolize the shallowness of the upper class.
The author decided to have Gatsby formally invite Nick through a chauffeur rather than Gatsby personally inviting him - this adds more mystery about Gatsby’s character. In the story, people that came for the party do not easily locate their host. This shows a mysterious part of Gatsby's character.
"The Great Gatsby" is a story by F. Scott Fitzgerald. The story tells of a man whose life was ordered by his desires.