Which one of the following is NOT a sub-company of the Volkswagen Group?
Explanation
The answer is Opel. Opel is not a subcompany of the Volkswagen Group, but rather a subsidiary of the French automotive company, Groupe PSA. In 2017, Groupe PSA acquired Opel and its British sister brand Vauxhall from General Motors, making it a part of their company. Therefore, Opel does not fall under the umbrella of the Volkswagen Group.