Answer:
Prefrontal Cortex
Step-by-step explanation:
"Prefrontal Cortex" is the part of the brain that is responsible for 'whisper ups.' This is the region of our brain which helps in planning the intricate cognitive behavior, expressions of personality, moderation/modification in social behavior as per different situations, and decision-making. We usually whisper to convey secret information to someone quietly to not disturb others and prevent the nearby listeners from hearing it which is a part of decision-making and moderation in social behavior. Thus, the 'prefrontal cortex' is the correct answer.