What is the right course of action?

Your answer is correct because you chose to turn left before the two cars on the right and left side.

According to German traffic rules, when you approach an intersection marked with the priority sign (a black cross on a white background inside a red triangle), you must give way to vehicles on the main road. The two cars you see are on the main road, and you need to wait for them to pass before you turn.

By turning left before the two cars, you position yourself correctly in the intersection without blocking traffic. This way, you respect the right of way of vehicles on the priority road. The other options imply turning after one or both cars, which would mean you are not respecting priority or could cause confusion and potential danger.

In summary, always give way to vehicles on the main road and make your turn only when it is safe and you don’t obstruct them. Your choice correctly follows this rule.