问题详情

What does Turker Nation do？
A) It reserves the right to refuse payment if a task is not completed satisfactorily.
B) It relies on legal or medical advice from an unknown online source.
C) It registers complaints about the advice offered on the site.
D) It reviews the companies that solicit and pay for tasks.请帮忙给出正确答案和分析，谢谢！