If you make an illegal sale and didn't meet a certain level of care that an ordinary person would meet (example: didn't check id, calculate age, refuse to overserve a patron, or look for signs of intoxication) this is the definition of being:
a) civil liability
b) criminally negligent
c) unemployable
d) irresponsible

B)

Explanation:

Based on the information provided within the question it seems that this is the definition of being criminally negligent. This term refers to when an individual acts in a way that "normal" people do, and by doing so may be putting others lives in danger. This seems to be the case in this scenario, since by making an illegal sale without checking ID or signs of intoxication, then the person might be underage or already drunk and may lead to them causing an accident and either hurting or killing someone.

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."