A Researcher Wants to Know How Much Time Students in a Dorm

Multiple Choice

A researcher wants to know how much time students in a dorm spend watching TV, but she has noticed that students tend to leave the TV room when she comes in to see who is watching. To get around this problem, she decides to observe wear-and-tear on the TV remote control as a measure of how much time students spend watching TV. Like many psychologists, this researcher is using a(n) :

A) hypothetical measure.
B) double-blind measure.
C) placebo measure.
D) unobtrusive measure.