An example of a pull factor would be

A good example of a pull factor would be "more job opportunities." A pull factor is something that attracts a person to a certain area, state, country, for beneficial reasons. More job opportunities, better living conditions, architect, more beautiful then other countries are all examples of pull factors.

Hope this helps.

the answer is a. laws were enacted in the aftermath of the plot to make it harder to free slaves,increasing sectionalism