Which challenge requires cooperation among nations to solve? a-the federal deficit and dept b-local political corruption c-the high cost of education d-international terrorism

D-International terrorism

Explanation:

International terrorist tend to have several bases located in different countries. Their members might resided as normal citizens in several different countries in order to avoid being caught all at once.

Because of difference in jurisdiction, it is impossible for law enforcement from one country to fully operate on the territory of other countries. Because of this, cooperation among nations are needed in order to handle such situation.

d. i assume the underlined word is "role." reformat if it isn't.

explanation:

role is closest to part because when replacing words, "playing a vital decision," "playing a vital activity," and "playing a vital dollar" don't make logical sense. the only meaningful choice is "playing a vital part."

this fits one of merriam-webster's definitions of role: "a function or part performed especially in a particular operation or process."