bbc recently polled hundreds of critics and industry insiders to name the 100 greatest tv series of the 21st century. which is your favorite of their top five picks?

ia cah hew la wh wh jak bd hew? ?

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."