What must be tracked in a daily log?

Answer: B — All duty status time

A daily log is an essential tool for commercial drivers, specifically regarding their compliance with regulations. The requirement to track all duty status time is crucial because it includes records of driving time, rest periods, and any other on-duty or off-duty time. This information is used to ensure that drivers adhere to the Hours of Service regulations, which are designed to prevent fatigue and ensure safety on the roads. Keeping accurate records of duty status time helps drivers and their employers manage schedules effectively while ensuring safety. It is a legal obligation that can result in penalties if not adhered to, emphasizing its importance in the trucking industry. While vehicle maintenance records, fuel consumption details, and passenger counts play important roles in overall fleet management, they are not typically included in the specific daily log that drivers must maintain to comply with regulations regarding hours of service.