Which of the following is an example of reflex behavior?

Reflex behavior is an automatic, involuntary response to a stimulus that does not require conscious thought. Jumping in response to a loud noise is a classic example of reflex behavior, as it occurs rapidly and is driven by the body’s instinctive reactions to perceived threats or sudden stimuli. This type of response is mediated by the nervous system and does not involve higher cognitive processes, which makes it distinct from behaviors that involve deliberation or choice.

In contrast, deciding to walk away from an argument, analyzing a complex problem, and choosing to smile at someone all involve conscious thought and decision-making processes. These actions require consideration of the context and the individual’s intentions, thus being examples of voluntary behavior rather than reflexive responses.