As Your Textbook Notes,there Has Been a Dramatic Increase in the Number

As your textbook notes,there has been a dramatic increase in the number of children diagnosed with autism spectrum disorder in recent decades.This increase is thought to stem primarily from:

A) greater awareness of the symptoms of this disorder.
B) an increase in susceptibility to the disorder.
C) changes in the levels of environmental toxins linked to the disorder.
D) the emergence of new viral factors.

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