Which of the following documents supports the daily logs?

Gas receipts are a key component that supports the daily logs because they provide verified documentation of fuel purchases during the course of a driver's workday. This information can help in confirming the distance traveled and the routes taken, as fuel receipts can indicate when and where fuel was purchased. This validation is crucial for maintaining accurate records and ensuring compliance with regulations regarding hours of service and vehicle usage.

The other options do not directly correlate with or provide support to daily logs in the same manner. For instance, a driver's license verifies the driver's identity and their legal ability to operate a vehicle but does not document daily activities. Route maps offer guidance for navigation but do not capture the specifics of trip details as communicated in daily logs. Similarly, vehicle registration offers information about the legal status of the vehicle but does not relate to the operational records kept in daily logs. Thus, gas receipts serve an essential function in linking financial transactions to the operational aspects of driving recorded in daily logs.