With Respect to Employment Law,which of the Following Statements Is

With respect to employment law,which of the following statements is most accurate?

A) Employment law has dealt extensively with the issue of employment at will,but has had little to say about other human resource issues.
B) Due to loopholes in the law,employment law is difficult to enforce.
C) Employment law has had a major impact on a wide range of issues related to human resource management.
D) Employment law has dealt exclusively with the issues of comparable worth and affirmative action,while laws at the state level have been concerned with issues such as worker training,job safety and collective bargaining.