Final answer:
d) All relevant daily information.
Captains night orders may include all relevant daily information such as crew health updates, navigation route changes, and weather updates.
Step-by-step explanation:
The daily additions that may be added to captain's night orders include a range of relevant daily information. This typically encompasses crew health updates, which ensure that any medical issues are promptly communicated; navigation route changes, which are crucial for maintaining the planned course and adjusting it as necessary; and weather updates, which are vital for anticipating and preparing for any changes in weather conditions that could impact the voyage. Therefore, the answer is d) All relevant daily information.