Which of the Following Statements Is Supported by Research on Lead

Multiple Choice

Which of the following statements is supported by research on lead exposure during childhood?

A) Overall, poorer intelligence test scores associated with lead exposure seem to be permanent.
B) Lead-exposed children given drugs to induce excretion of lead improve in long-term outcomes.
C) Once lead-exposed children move away from contaminated areas, their intelligence test scores increase.
D) Negative lead-related cognitive consequences are evident only at high levels of exposure.