3) Which of the following statements most accurately summarizes the author's explanation for the increase in reported cases of ASD over the past 25 years?
A. Over the past 25 years, parents have been more likely to have their young children inoculated
against MMR.
B. Since the results of Wakefield's study were published, parents have been less likely to have their
young children inoculated against MMR.
C. In the past 25 years, doctors have developed a better understanding of genetics, which is thought
to be the leading factor in whether or not a child will develop ASD.
D. The drastic changes in our environment that have occurred over the past 25 years have most
significantly contributed to an increase in cases of ASD.
E. The increase in reported cases of ASD is mainly the result of an increased understanding of how
to recognize ASD.