You want to continue driving straight ahead. What is the right course of action?

Your answer is fully correct. According to German traffic rules, when you want to continue driving straight ahead and you are already waiting in your lane, you should remain in that lane (option 1). Additionally, if there is enough space in the traffic, you are allowed to move to the right (option 2), which can help ease congestion or prepare for a smoother flow.

Overtaking the vehicle alongside you and switching lanes (option 3) is not appropriate here, especially at a stop in traffic, as it can be dangerous and is typically not allowed unless there is clear space and it does not disrupt other road users.

In summary, staying in your lane and moving to the right if possible is the correct and safe course of action when going straight in this traffic situation.