The option that best describes the cause-and-effect structure in a memoir is when the structure focuses on an incident and its consequences.
I would say that the correct option is the third one.
The cause is the incident, and the effect are its consequences.
When she was caught cheating, she had the audacity to blame her classmates for making cheating easy.
because when she was caught cheating she had the NERVE to blame her classmates. She had the AUDACITY to blame her classmates.
The “hook” is the opening sentence that grabs the readers attention.
the answer is most likely the first sentence