Which question helps identify when a behavior occurs most observably?

The option that effectively identifies when a behavior occurs most observably includes the question "when," which directly targets the timing of the behavior. Understanding when a behavior happens allows practitioners to recognize patterns and triggers associated with it, leading to more effective analysis and intervention strategies.

In addition to "when," the inclusion of "what" encourages the identification of specific behaviors, while "how" can provide insight into the manner in which the behavior is exhibited. These questions collectively focus on the observable aspects of behavior in terms of timing and context, which are essential for effective behavior analysis and planning.

In contrast, the other options might address other dimensions of behavior or context, but do not prioritize the important temporal aspect, which is critical for observing frequencies, patterns, or any situational influences on the behavior in question.