Answer:
The answer is D. It initially caused a large drop in chicken pox cases in the United States, and the rate continues to decrease
Explanation:
Option A is incorrect, as we can see in the graph that the number of chickenpox cases never reached 0, even at its lowest point.
Option B is incorrect because, even though the rates had been decreasing before 1995, we can see a very rapid drop in the number of cases since 1995, leading to its lowest point in 2011.
Option C is incorrect . Based on the numbers on the graph, from 1995 to 2011, the number of chickenpox cases decreased from somewhere around 125,000 to somewhere around 10,000, meaning there were around 115,000 less cases, or 92% less cases.