Liability to Business invitees. John went to Lisa's Market to pick up a few items for dinner. It was a rainy, windy day, and the wind had blown water through the door of Lisa's Market each time the opened. As john entered through the door, he slipped and fell in the approximately one-half inch of rainwater that had accumulated on the floor. The manager knew of the weather conditions but had not posted any sign to warn customers of the water hazard. John injured his back as a result of the fall and sued Lisa's for damages. Can Lisa's be held liable for negligence in this situation? Please Explain.