In which area of psychology would one study how perception affects decision-making?

Cognitive psychology is the correct choice because it focuses on understanding mental processes such as perception, memory, reasoning, and decision-making. This branch of psychology delves into how we process information, how we perceive the world around us, and how those perceptions ultimately influence our decisions and behaviors.

In the context of decision-making, cognitive psychology examines how our thoughts, beliefs, and mental frameworks affect the choices we make. This includes analyzing how biases and heuristics derived from our perceptions can lead us to different outcomes in decision-making scenarios.

Other areas, while significant in their own right, do not focus primarily on the interplay between perception and decision-making. Behaviorism primarily looks at observable behaviors and the conditions that shape them, rather than internal mental processes. Social psychology studies how individuals interact, influence each other, and are affected by social contexts, but it doesn't center on the cognitive aspects of perception. Developmental psychology investigates how individuals grow and change over their lifespan, touching on cognitive development but not specifically on the relationship between perception and decision-making.