A source document for tracking employee hours is called a:

The correct answer indicates that a labor time record is an official document used to track the hours worked by employees. This source document captures detailed information such as the time an employee starts and finishes their shift, as well as any breaks taken during that period. It plays a critical role in payroll processing and ensures employees are compensated accurately for their worked hours.

While employee attendance sheets and work schedules are related to tracking employee presence and task assignments, respectively, they do not provide the detailed information about the actual hours worked that a labor time record does. A timecard can also serve a similar purpose, but the specificity of "labor time record" emphasizes its function more directly related to recording work hours for payroll purposes.