What is the officer indicating from the vehicle?

What is the officer indicating from the vehicle?
A)Roadway temporarily closed to traffic.Correct
B)Drive with extreme caution.
C)That the user to whom the signal is directed is required to stop on the right side.
The red flag indicates that from the moment the vehicle carrying it passes, the roadway is temporarily closed to the traffic of all vehicles and users, except for those accompanied or escorted by the agents of the authority responsible for the regulation, management and control of traffic.
A yellow flag indicates to the rest of the drivers and users the need to be especially attentive or the proximity of a danger. This flag may also be used by authorised auxiliary personnel performing functions of order, control or safety during the development of cycling marches or any other activity, sporting or otherwise, on roads subject to legislation on traffic, motor vehicle circulation and road safety.
The green flag indicates that, from the moment the vehicle carrying it passes, the roadway is again open to traffic.