Final answer:
In the nursing process, 'Diagnosing' is the phase where actual and potential health problems are identified by analyzing assessment data.
Step-by-step explanation:
The step of the nursing process that identifies actual and potential problems is B) Diagnosing. This phase involves analyzing the collected data during the assessment phase to identify whether the problems are actual health diagnoses or at risk for developing problems. Characteristics of newborns, infancy development, and childhood growth all feed into the diagnostic process, wherein nurses use their professional judgment to determine the nature and cause of health-related issues.