Which of the Following Constitutes an Illegal Hiring Practice

Which of the following constitutes an illegal hiring practice?

A) asking someone about their availability because the position requires a 50-hour work week
B) establishing a diversity committee to help diverse employees connect with each other
C) asking a candidate whether or not he attends church, because it is important that candidates are available to work on Saturdays and Sundays
D) keeping track of how many males and females are in the organization
E) requiring an applicant to specify gender on an application