At the edge of the lawn, behind the building, there was a line of underbrush and trees sloping down a hillside. Beyond that, there was a playground next to a day-care center. They could hear shouts of children in the air, and when they looked through the underbrush, they could see bundled-up four-year-olds swinging on swings and racing around a playhouse. The operation would be carried out near children. –The Hot Zone, Richard Preston What is the author’s purpose for including this paragraph? Check all that apply.