You may enter the middle lane of a three-lane two-way road only to overtake, to bypass, to turn left or to make a U-turn.
Outside populated areas, the driver must drive in the lane as far to the right as possible (clause 55). On a three-lane road with two-way traffic, entering the shared middle lane is permitted only to overtake, to bypass, to turn left or to make a U-turn (clause 54), while the far-left lane is only for oncoming traffic. So the correct option is the one that combines both of these cases.
Option 1. This option is incomplete, because entering the middle lane to turn left or make a U-turn is also permitted.
Option 2. This option is incomplete, because entering the middle lane to overtake or to bypass an obstacle is also permitted.
Option 4. It is wrong, because the middle lane can indeed be used for all the purposes named in the other options.