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The Environmental Protection Agency (EPA) of the United States recommends taking corrective measures to reduce exposure to radon gas. The EPA has set an action level of 4pCiL for radon gas. The graph below shows radon samples taken from seventeen buildings in California. The radon samples were taken from the air inside the buildings, and the uranium concentrations were sampled from the soil under the buildings. Data points from four of the seventeen building locations are labeled A-D.Which of the following conclusions can best be drawn from the data in the graph?ALocation A has the greatest need for remediation because the radon levels in the building are the highest and exceed the EPA action level.BLocation B has the lowest need for remediation because the radon levels in the building are below the suggested action level.CLocation C has the greatest need for remediation because the radon levels in the soil are the highest.DLocation D has the lowest need for remediation because there is no measurable radon in the air or the soil samples.

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