In a roadworks zone where the carriageway has narrowed, which vehicle has priority if there is no sign regulating it?

In a roadworks zone where the carriageway has narrowed, which vehicle has priority if there is no sign regulating it?
A)The one that has the narrowing on its right.
B)The one that does not have to change lane to enter the narrowing.
C)The one that entered first.Correct
At a narrowing with no signs regulating right of way, the vehicle that enters the narrowing first has priority of passage. Normally these narrowings are signposted with the relevant signs.