Answer:
A. negligent behavior
Step-by-step explanation:
In US law, negligent behavior refers to a situation where a party failed to perform with an adequate level of care that someone else would have exhibited under the same circumstances. In this case, the operator of the roller coaster at the State Fair was required to follow certain safety procedures and provide adequate maintenance to the ride. However, the derailment showed that this wasn't the case, thus, Doris can sue them and demand compensation for her psychological damage because of their negligence.