Final answer:
The best action for addressing a first-grade student's tantrums is to complete a functional behavior analysis to identify the reasons behind the behavior and plan interventions.
Step-by-step explanation:
The most appropriate action for the professional school counselor to take when a first-grade student is throwing tantrums in class is completing a functional behavior analysis (FBA). An FBA helps identify the reasons behind behavior problems by considering environmental factors, thus allowing for targeted interventions. By contrast, initiating a psychiatric evaluation is a more severe response and typically not the first step. Requesting an Individualized Education Program (IEP) team meeting may be a subsequent step if the FBA suggests the need for special education services, but an IEP meeting is not specifically designed to assess behavior. Administering a projective personality test is not appropriate for understanding specific antecedents and consequences of behavior in this context.