A nurse in a pediatric behavioral unit is assessing a 6-year-old child who has been exhibiting regressive behaviors such as thumb-sucking clinging to the parent and expressing jealousy toward a newborn sibling. According to Freud's stages of psychosexual development, which of the following interpretations is most consistent with the child's behavior?

The child is in the phallic stage and is displaying typical Oedipal conflict and rivalry.

The child is fixated at the oral stage and is seeking oral gratification due to unmet early needs.

The child is experiencing regression to the anal stage, often marked by control and defiance.

The child is in the latency stage, and the regression suggests unresolved earlier conflicts.