Question

pea - sized structure that helps regulate many vital bodily functions, emotional states, and responses to stress
brainstems
midbrains
hypothalamus
hippocampus
forebrains

Explanation:

The hypothalamus is a pea - sized structure in the brain that regulates many vital bodily functions such as body temperature, hunger, and sleep - wake cycles. It also plays a role in emotional states and responses to stress. Brainstems are involved in basic life - sustaining functions like breathing and heart rate. Midbrains are part of the brainstem and are involved in vision and hearing. The hippocampus is mainly associated with memory. The forebrain is a large region that includes the cerebral cortex and other structures.

Answer:

C. hypothalamus