Which of the Following Observations Is an Example of a Positive

Which of the following observations is an example of a positive correlation?

A) When a population's vitamin D intake decreases,the percentage of people in the population that have healthy immune systems decreases.
B) When a population's intake of plant foods decreases,the percentage of obese people in that population increases.
C) When a population's level of physical activity increases,the percentage of people who develop heart disease decreases.
D) When a population's intake of vitamin A decreases,the percentage of people in the population who develop blindness increases.

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