"Knowledge" as an Element of the Tort of Negligent Hiring

Multiple Choice

"Knowledge" as an element of the tort of negligent hiring, means all of these EXCEPT:

A) the employer knew the employee was unfit
B) the employer should have known the employee was unfit
C) the employer would have known the employee was unfit if it had done an appropriate background check
D) the employer had no first hand knowledge of unfitness