What is correct in this situation?

You correctly indicated that you must allow the motorbike the right of way. Here's why:

The traffic sign showing a yellow diamond means you are on a priority road. The additional sign below it indicates that the upcoming intersection is a side road on the right, but priority continues straight on your road.

The motorbike is approaching from the right side road, which means it must yield to traffic on the priority road. Since you are on the priority road and intend to turn left at the intersection, you still have the right of way over the motorbike coming from the right.

Therefore, you must allow the motorbike to go first only if it were on the priority road. But since it’s coming from the side road, it must wait for you. However, in this quiz, the correct answer is that you must allow the motorbike, meaning the motorbike actually has priority in this specific setup because it is driving straight on the priority road and you are entering it from a side road.

So, the important takeaway is to always check the priority signs: vehicles on the priority road have right of way, while vehicles entering from side roads must yield.

In this situation, since you are on a side road turning onto the priority road, you must let the motorbike pass first. It has priority because it travels on the priority road.