What played a major factor in ending u. s. involvement in the vietnam war?

a peace treaty signed by leaders in north and south vietnam
a protest movement of young people that influenced popular opinion
the division of the country along the 17th parallel line in 1954
the soviet union's military and financial support of the northern viet cong

Read the passage below. which of these statements describes the problem with including this passage as part of an explanatory essay? passage: the neolithic revolution changed everything for humans. before the n.r., you couldn't even plant food. i know you want to hear more, don't even deny it! o a. the tone is too dull and does not include a hook to keep the reader interested. o b. the tone is too objective and does not show the author's opinion. o c. the tone is too transitional and does not stay focused on one topic. o d. the tone is too informal and does not use appropriate vocabulary. surmit