What is correct in this situation?

In this situation, you must prioritize the motorbike approaching from the right, signaling that it has the right of way according to German traffic regulations. This principle is part of the "right-hand rule," which dictates that vehicles coming from the right have priority at intersections without specific traffic signs indicating otherwise.

Since the scenario also involves a left turn, it is important to signal your intention to turn left clearly. Failing to acknowledge the motorbike's right of way could lead to an accident. Therefore, the combination of yielding to the motorbike and signaling your turn is crucial for safe navigation at the intersection. Understanding these rules helps ensure the safety of all road users.