You are travelling on a main road. Which road sign ends your right of way?

The first sign (yield sign) ends your right of way because it explicitly requires you to give priority to other road users, meaning you no longer have the right of way on the main road.

The second sign (end of priority road) also ends your right of way. This sign means you are leaving a priority road, so from this point forward, you must obey the usual right-of-way rules (e.g., yielding to traffic from the right) until another priority road sign appears.

The third sign is just a warning about an intersection with a side road and does not end your right of way on a main road by itself.

In summary, the yield sign and the end of priority road sign both indicate the end of your right of way on a main road, which is why both are correct answers.