The older a person is when moving to a new country with an unfamiliar language, the harder it is to learn the language. this best illustrates the importance of for learning language.

well the unjest treatment and discrimination did get faced by the idians and soldiers

explanation:

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."