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In Arumville, among those young children with elevated levels of lead in their blood, few live in houses containing lead-based paint, but many live in areas where vehicular traffic is heavy. These children's elevated blood-lead levels probably result from lead added to gasoline, since, although gasoline sold in and around Arumville has been lead-free since 1990, lead from vehicle exhaust remains in the soil for many years.

Which of the following, if true, most strengthens the argument?
  • Sales of lead-based paint for use in homes was banned in Arumville in 1977.
  • Vehicle traffic in most residential areas of Arumville is heavier today than it was twenty years ago.
  • Some lead in the soil comes from deteriorating lead-based paint on the exteriors of buildings.
  • In Arumville, children's blood-lead levels typically rise during the warm summer months when children frequently play outdoors but not in the winter when children spend more time indoors.
  • If improperly carried out, the removal of lead-based paint from older houses can significantly increase the risk that children living in such houses will ingest lead dust.
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