Ella is working on a report analyzing the relationship between parental and teen smoking. She found this graph during her research:

Which of the following claims is BEST supported by the evidence in the graph?
A. There appears to be a close connection between smoking rates in adults and teens.
B. Over the past two decades, reductions in teen smoking rates have mirrored the rates for adults.
C. Adult smoking rates had been dropping for more than 30 years before teenagers began reducing their rates.
D. Both teens and adults have severely dropped their rates of smoking and instead have turned to more healthy activities.