Answer:
Kim is most likely suffering from post-traumatic stress disorder (PTSD).
Step-by-step explanation:
We learned from the passage that Kim went through a traumatizing event - a tragic accident in which her son and husband were killed. After the accident, she began to have nightmares related to it, leaving her with feelings of helplessness and anxiety. Those symptoms are consistent with post-traumatic stress disorder, or PTSD.
PTSD is a mental condition that develops after a person experiences or witnesses a traumatizing event. Besides nightmares, symptoms can include physical reactions, emotional distress, flashbacks, hopelessness about the future, etc. Symptoms tend to appear months after the event, on occasion even years later.