What does the green arrow on the traffic light indicate?

A)That I may turn right when the main traffic light turns green.
B)That I may turn right with priority.
C)That I may proceed in the direction indicated by the arrow, with caution and giving way to vehicles travelling in the lane I am joining.Correct
A green arrow illuminated on a black circular background means that vehicles may proceed in the direction and sense indicated by it, regardless of which light is simultaneously lit on the same traffic light or on an adjacent one.
Any vehicle that, when the green arrow lights up, is in a lane reserved exclusively for travel in the direction and sense indicated by the arrow must proceed in that direction and sense, even if no vehicle is following it.
Vehicles proceeding in accordance with a green arrow must do so with caution, giving way to vehicles travelling in the lane they are joining and not endangering pedestrians who are crossing the carriageway.