I believe the answer is: The control group would be cars that were washed by hand
The control group exist in order to measure the result that created by subjects that recieve specal treatment (the special treatment in this case would be the automated car wash).
In the example above, the result from automatic car wash would be controlled by comparing it to the result from handwashed cars.
The League of Nations, was the first worldwide intergovernmental organisation whose goal was to maintain world peace. Hope this helps.
Assuming you mean Zeus, the king of Greek gods, Zeus was worshipped by the Greeks during the time of the ancient Greek empire.
