The correct answer is A. Time Day .

In Workday Time Tracking, when a calculation needs to evaluate a specific day-level attribute such as whether the day is Sunday , the appropriate business object is Time Day . This is because the concept of Day of Week belongs to a single calendar day, and Workday stores day-based evaluation logic on the object that represents an individual day in the time calculation framework.

A True/False condition calculated field for something like Day of Week = Sunday is used when time calculations need to identify specific days for purposes such as weekend premiums, seventh-day rules, special overtime treatment, or other schedule-driven logic. Since the condition is testing one day at a time, Time Day is the correct and most precise object.

The other options are less appropriate. Time Week is used when calculations need to look across an entire week, such as weekly totals or weekly thresholds. Time Block focuses on individual reported or generated entries, not the calendar-day attribute itself. Worker is used for worker-specific attributes and eligibility logic, not for determining the day of week within time calculations.

So, for a True/False calculated field checking whether the day is Sunday, the correct time-related business object is Time Day .