Help me please I need to be done with this

What was a major cause of world war i?

Plz how did the jews of the diaspora preserve their heritage?

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.