Answer:
The core answer is C. The amygdala will be reactivated, and the initial unpleasant memory will be brought back.
Step-by-step explanation
The amygdala is a section of the brain that is responsible for detecting fear and preparing for emergency events
The amygdala is known as the fear center of the brain but also plays key role in emotions and behaviour so if Lucas comes across a monkey in the park, his amygdala will be reactivated, and the initial unpleasant memory of the monkey will be brought back.