Enumarated definition

Which quotation from the declare ration of independence shows the idea of the social contract

Which of the following world and national events led to a new view of people with disabilities in the us:     a.  world war i and ii veterans with disabilities returned home after the wars.b.  john f. kennedy was elected president and had a sister with a disability.c.  the civil rights and feminist movements.d.  all of the above.

Why did kennedy choose lyndon b. johnson to be his running mate