A study determines that there is a strong positive correlation in the U. S. between teachers' salaries and annual consumption of liquor. Which of the following statements is the most valid conclusion?
A. If you increase teachers' salaries, annual liquor consumption will increase.
B. Changes in annual liquor consumption are determined to a large extent by teachers' salaries.
C. Teachers spend much of their free time drinking.
D. None of the above is a valid conclusion because there's a lurking variable unaccounted for.