The answer is the D because is a lab and the blood test results
The correct answer is before sentence three. Hope this helps.
After 1830 the urban areas of the country grew more rapidly than the rural areas. By 1890 industrialization had produced substantial growth in cities, and 35 percent of Americans lived in urban areas, mostly in the northern half of the United States.
He just tries to say what the character is doing to get an idea of the story
