challenge: What was the outcome of the OCR's calculation regarding the effect of spraying methyl bromide on children in the vicinity?
  
  A. The exposure levels were below the EPA's threshold of concern for both short-term and long-term exposure.
  B. The long-term exposure levels exceeded the EPA's threshold of concern, but the short-term exposure levels did not.
  C. The short-term exposure levels exceeded the EPA's threshold of concern, but the long-term exposure levels did not.
  D. Both short-term and long-term exposure levels exceeded the EPA's threshold of concern.
  Answer: 