The correct answer is - pull factors.
The increased freedom and much more employment opportunities in the United States can be considered as pull factors. They can be considered as pull factors because they are big reasons why people from all around the world got attracted to the idea of migrating to the United States, as they saw a nice chance to prosper and have a better life. Most of the countries were still struggling with the freedom issues, and the employment opportunities were either very limited, or badly payed, so no wonder that pople wanted to move in the United States.
i would say that it would be B
I believe the answer is: B. because his scientific endeavours in electricity were noteworthy.
King Louis was only in his early twenty's at that time. Because of many of Franklin's work in electricity field, he became very popular in French and King Louis wanted to meet him in order to discuss the application of electricity in French, and even willing to pay Franklin with a huge amount of money for it.
People choose to live in a larger community during Neolithic age than in earlier times because they required and needed a huge number of people for gathering and hunting. They had an enduring shelter, so people decided to attach to a different group so the communities getting bigger and bigger. And aside from that, they could grow sufficient foods to support more people one of this practice is farming.