Two pictures including hands on a computer and a woman studying with the words, "Practice Question of the Week"

What is the correct diagnosis?

Question: A college student has been in counseling for several weeks. She reports having difficulties
falling asleep and nightmares related to the rape of her sister that she witnessed four
months ago on her school campus. She now misses classes and after-school activities. She
says that she feels angry, disconnected from others, and has gaps in memory when she talks
about the rape of her sister. Which of the following diagnoses best describes the client?