In Order to Avoid Liability for Negligent Hiring,the Primary Question

In order to avoid liability for negligent hiring,the primary question an employer must consider is:

A) whether the employer's own written hiring policies are adequate
B) whether placing an unfit person in the particular job could be expected to result in harm
C) whether there is evidence of a candidate's unfitness that could be found through a thorough personal interview with the applicant
D) all of the above
E) none of the above