The curve below shows the percentage of population of aquatic species that die in response to doses of pollutant A:
(REEFER TO CURVE)
A local manufacturing plant reports a spill that released pollutant A into the local watershed. Pollutant A is a toxic substance. Local officials must determine if the residents should be evacuated from the area. Initial groundwater samples show pollutant levels at 5 mg/kg of water. Which decision is supported by the empirical evidence provided by the dose-response curve?
A)Evacuation is not needed; continue groundwater monitoring.
B)Residents should be evacuated until levels decrease.
C)The spill no longer needs monitoring.
D)Residents should only evacuate above LD50
