All three vehicles want to turn left. Which is in the correct lane?

You answered correctly. The yellow car (answer 1) is in the correct lane to turn left. According to German traffic rules, when there are median islands or obstacles that separate lanes, you must use the lane to the left of the traffic island or obstacle for left turns. The green car and the truck are both incorrectly positioned because they are either on the wrong side for a left turn or not using the proper lane. Always make sure to be in the far-left lane when turning left unless signs or road markings indicate otherwise. This helps ensure safe and predictable traffic flow.