B) Constructive feedback
Constructive feedback would be the most beneficial in this situation, as it focuses on identifying areas for improvement and provides guidance on how to address the issues that led to missing the deadline. This type of feedback can help the employee understand the specific factors that contributed to the oversight, learn from the experience, and develop strategies to prevent similar issues in the future. While positive feedback can boost morale and continuous feedback is valuable for ongoing development, constructive feedback is essential for addressing the immediate concerns related to missed deadlines and enhancing overall performance.