Answer: The correct option is D. Staff Authority.
Explanation: Staff authority referees to the service in form of advice and other support, that people in a particular staff position render to line managers.
The people in these staff positions do not have any form of power over the managers. They only perform advisory functions. Staff authorities in an organization include tax department, finance department etc.
In the scenario given in the question above, Brenda holds the position of staff authority over Ben because Brenda is advising Ben (the marketing manager) on good financial practices that could be followed when implementing various marketing strategies.