Which of the Following Would Be an Effective Way to Determine

Which of the following would be an effective way to determine a just noticeable difference (JND) ?

A) Piling five-pound bean bags on your friend's foot until he reaches his pain threshold
B) Turning a radio on and off repeatedly until your roommate stops noticing it
C) Lifting the lid from a pot of cooking stew and inhaling deeply
D) Reducing the intensity of a light beam against a wall until you can no longer detect it

Correct Answer:

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