Circus Pizza contracted with Art to run its birthday parties. Art's responsibilities included supervising the children and organizing the games. Circus did not investigate Art's background, which included a history of assaulting children. Art assaulted a 7-year-old girl in the restaurant's kitchen during a birthday party. Circus Pizza:

a. cannot be liable for the damages because Art committed an unforeseeable intentional tort.
b. cannot be held liable for the damages because Art's conduct was not in the scope of employment.
c. may be held liable on the basis of negligent hiring.
d. may be held liable only if Circus actually knew of Art's background.

c