the command duty officer has informed you that the side boys must muster at 1200 on the quarterdeck what individuals re responsible for thr muster and inspection

answer is b shrapnel injuries

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."

answer; the parasympathetic nervous system;