What is the right thing in this situation?

In this situation, the traffic sign on the right side of the road gives priority to oncoming vehicles when the road narrows. This means you must wait and allow the oncoming car to pass through the narrow section first before you proceed. The correct answer is "after the oncoming car has done so." This rule ensures safe passage through narrow spots and prevents blockages or conflicts. Always watch for these priority signs and yield to traffic coming from the opposite direction when required.