He does not just happen to attend; he was the first one to receive a personal invite from Gatsby's butler. After that, he begins to form a friendship with Gatsby and goes to his parties regularly. Hope that helps :/
The question is asking to choose among the following choices that made Americans so willing to engage in stock market speculation in 1920s'. Based on my research and further understanding, I would say that the answer would be Speculation helped many low-income people move to the middle class.
Answer: It is a smaller planet-like sphere orbiting a planet.
Explanation: A planet is usually a mid-sized, life-sustaining, sphere. Any 'ball' smaller than the planet that orbits the planet, is a moon.
