What does an officer indicate with a red flag?

A)Take extra care due to the proximity of a hazard.
B)Roadway temporarily closed to traffic for all vehicles and users.Correct
C)Obligation to stop on the right-hand side.
The red flag indicates that, from the vehicle carrying it onwards, the roadway is temporarily closed to traffic.
If the flag were yellow, it would indicate the need to take extra care due to the proximity of a hazard.
If the officer were to extend their arm downwards, inclined and still, it would require us to stop on the right-hand side.
If the flag were yellow, it would indicate the need to take extra care due to the proximity of a hazard.
If the officer were to extend their arm downwards, inclined and still, it would require us to stop on the right-hand side.