Final answer:
The limbic system is a collection of structures involved in emotions and memory, including the hippocampus, amygdala, and parts of the thalamus and hypothalamus.
Step-by-step explanation:
The collection of structures involved in emotions and memory is the limbic system. This interconnected system includes key areas such as the hippocampus, amygdala, and parts of the thalamus and hypothalamus. The hippocampus is crucial for learning and memory; the amygdala is essential for processing emotions, particularly fear; and the hypothalamus regulates homeostatic processes. Together, these structures help regulate emotional responses and the formation of memories. Therefore, the correct answer to the question is B) Limbic system.