With certain exceptions, a bus driver must have how many off-duty hours per day?
Answer: B — 10
A 8 hours of off-duty time is not enough for a bus driver as they are required to have at least 10 hours for rest and safety purposes. C: 12 hours is too much off-duty time as it could lead to longer shifts, causing fatigue and potential safety hazards. D: Similarly, 14 hours of off-duty time is excessive and could result in longer work shifts and potential fatigue.