Jeff and Josh are drinking margaritas and driving golf balls out of their backyard into the alley behind their property. While he is walking his dog in the alley, one of the golf balls hits Tim in the head and causes injuries that require medical attention. No one knows if Jeff or Josh's golf ball hit Tim. If Tim sues, a court will likely find :________
a. Jeff and Josh were negligent
b. Jeff and Josh are jointly liable
c. Jeff and Josh were acting in concert
d. all of the above