What are the possible consequences if the wheel nuts are not re-tightened following a tyre change?

The selected combination is entirely correct. In accordance with German traffic regulations, properly retightening wheel nuts after a tyre change is crucial for safety. If the wheel nuts are not secure, two primary consequences can occur: the wheel may become damaged due to excessive movement or misalignment, and the wheel itself can detach from the vehicle, leading to a serious accident. Both scenarios underscore the importance of ensuring that all components are properly secured before driving, as well as reflecting the adherence to proper maintenance protocols established in road safety laws.