What can we say about the graph below?
A. There is a negative relationship between the number of cigarettes smoked per day before the intervention and the number of cigarettes smoked after the intervention.
B. There is no relationship between the two variables
C. The participants who smoked the most cigarettes per day before the intervention, smoked the fewest cigarettes per day after the intervention.
D. There is a positive relationship between the number of cigarettes smoked per day before the intervention and the number of cigarettes smoked after the intervention.
Answer: D
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