Which of the following observations is an example of an inverse correlation?
A. When a population increases its daily consumption of whole-grain products, the population's frequency of daily bowel movements increases.
B. Women who smoke 5 or more cigarettes each day during pregnancy are more likely to give birth to underweight babies than women who smoke fewer than 5 cigarettes a day during pregnancy.
C. As a population's dietary intake of beta-carotene increases, the population's tissue levels of vitamin A increase.
D. Children who consume 3 cups of vitamin D-fortified milk daily develop stronger bones than children who drink fewer than 3 cups of vitamin D-fortified milk each day.
Answer: B
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