What key factors led to the american victory at saratoga

The internal combustion engine was an innovation of

•the impact of enlightenment ideals on the development of economic, political, and religious structures in the western world

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.