Which of the Following Observations Is an Example of an Inverse

Which of the following observations is an example of an inverse correlation?

A) When members of a population increase their consumption of milk and milk products,their risk for bone fractures decreases.
B) As children increase their physical activity level,they develop greater muscle mass than children who are less active.
C) When pregnant women gain more weight than average,they are more likely to give birth to babies who are heavier than average.
D) When children eat three or more servings of fruits and vegetables a day,their blood levels of vitamin C increase.