Answer:
The correct answer is: A challenge stressor.
Explanation:
A challenge stressor can be defined as a request that is considered stressful, challenging, demanding, and difficult by the individual to whom the request is made, but he or she also considers the task as an opportunity for learning, improving, achieving, and mastering a particular skill.
A challenge stressor is a demand that is both rewarding and stressful, and the individual can approach it either constructively or destructively.
In this particular case, Sven is encountering stress resulting from challenge stressors because the bank hired him as a supervisor trainee and therefore he has to take all of the responsibilities of a regional supervisor.
Sven probably feels glad for this opportunity but anxious because it is a new level of responsibility that he has acquired.