In a roadworks zone, a worker signals you to stop your vehicle — are you obliged to obey?

In a roadworks zone, a worker signals you to stop your vehicle — are you obliged to obey?
A)No, only traffic officers are authorised to regulate traffic.
B)No, roadworks personnel can only warn of the need to exercise extra caution.
C)Yes, in the absence of traffic officers, roadworks personnel are authorised to regulate traffic.Correct
Road users are obliged to follow the instructions of roadworks personnel assigned to regulate the passage of vehicles.