ASAP, help me, please! 20 points!
Which is an example of unstructured observation?
(A): A researcher watches the cars entering a mall parking lot and records the number of red cars.
(B): A principal observes a teacher to see if the teacher completes all items on an evaluation checklist.
(C): An undercover police officer joins a gang in order to observe its members and activities.
(D): A day-care worker observes a particular child who has been accused of biting other children.
