Which factor has the broadest and deepest influence on behavior?

Culture has the broadest and deepest influence on behavior because it encompasses the values, beliefs, customs, and practices shared by a group of people. It shapes individuals' worldview, influences their behaviors, and informs their responses to various situations and stimuli in their environment. Culture is deeply ingrained, often learned from an early age, and affects nearly every aspect of life, including communication styles, attitudes towards authority, concepts of time and space, and social norms.

While social class does influence behavior, it is often a reflection of cultural factors and can fluctuate with economic changes. Personality pertains to individual traits and characteristics but does not encompass the wider societal influences that shape behavior. The environment can also play a role in affecting behavior, but it is typically more context-specific and does not have the same pervasive and long-lasting impact as cultural influences. Thus, culture is the foundational element that permeates various facets of life and has a profound effect on how individuals behave and interact with each other.