Final answer:
The next step after a nurse completes a database and nursing interventions is evaluation. This phase is where the effectiveness of the interventions is assessed and it determines the future course of the nursing care plan.
Step-by-step explanation:
After a nurse has completed a thorough database and carried out nursing interventions based on priority diagnoses, the next step in the nursing process is d. Evaluation. The evaluation phase involves assessing the outcomes of the nursing interventions to determine if the set goals have been met, partially met, or not met. This phase is critical as it informs the nurse whether the care plan needs to be continued, modified, or terminated.