What are two innovations in communication technolgy in the early 1800s that allowed information to travel more quickly?

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."

the works of justice saves things/people

the works of service things/people

explanation:

that's the best i can word it. hope it !