The Graph Shown Indicates the Incidence of Whooping Cough in the United

The graph shown indicates the incidence of whooping cough in the United States.What information can you determine from this graph?

A) There was a decline in vaccination rates of infants under one year of age during the early 1990s.
B) The incidence of whooping cough in infants under one year of age was declining prior to 1990.
C) Waning immunity in adult populations has led to an increase in whooping cough.
D) The incidence of whooping cough in infants under one year of age was higher in 2010 than it was in 1995.