What made president nixon's trip to red china so significant?

the united states and red china were at war at the time.
it was the first time an american president had visited china.
the two nations reached an agreement on nuclear weapons.
mao zedong and richard nixon had always been bitter enemies.

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.