When a Large Black Cable Is Laid Across a Street

Multiple Choice

When a large black cable is laid across a street to count the number of cars that travel along that street in an attempt to use the information to decide whether or not to install a traffic light at the next intersection,this is an example of:

A) human observation.
B) a contrived situation.
C) a closed observation.
D) machine observation.
E) a GSR observation.