A city with a large stock of housing built before 1978 is considering two public health initiatives to reduce childhood lead exposure. Initiative A proposes a large-scale project to clean up contaminated soil at a former industrial site on the city's outskirts. Initiative B proposes a program to fund lead paint inspection and removal within older residential buildings. Based on the most common and persistent sources of lead exposure in the US, which initiative is likely to be more effective at reducing the overall rate of childhood lead poisoning in the city? Justify your answer.