Where is stopping prohibited?

The combination of options 1, 2, and 3 you selected is correct because it reflects crucial areas where stopping is prohibited according to German traffic regulations.

1. Stopping on the roadway when there is a sufficiently wide hard shoulder is dangerous as it can obstruct traffic flow, leading to potential accidents.

2. Stopping between lane dividers when direction arrows are marked is also not allowed, as it can disrupt the intended traffic direction and confuse other drivers.

3. At taxi ranks, stopping is prohibited because these areas are designated for taxis to pick up and drop off passengers, thus ensuring the efficient operation of public transport and preventing congestion.

Selecting all three options is necessary to ensure comprehensive adherence to traffic laws designed to maintain safety and smooth traffic flow. Each prohibition addresses a specific safety concern crucial for all road users.