Question help please.

Drop down list options are:

people per kilometer

people per square kilometer

people per cubic kilometer

The accompanying bar graph shows the resident population and the land area of a particular country for selected years from 1800 through 2000. Use the information to find the population density of a certain country for the year 1900, to the nearest tenth, expressed in people per square 1 in = 6.5 cm2 kilometer. 1 ft2 = 0.09 m Bar Graph and Data - X 1 yd = 0.8 m- 1 mi = 2.6 km 1 acre = 0.4 hectare (ha) Click here to view the bar graph. Resident Population and Land Area The population density in 1900 was approximately Population Land Area (Round to the nearest tenth as needed.) 350- 4.0 300 3.5 250 3.0 200 2.5 Land Area (millions of square miles) Resident population (millions) 150 2.0 100- 1.5 50 1.0 1800 1900 1940 1980 2000 Year Year Population Land Area (square miles) 1800 5,308,483 864,746 1900 75,089,162 2,899, 120 1940 131,669,275 2,971, 128 1980 226,545,805 3,539,289 2000 276,563,623 3,550,365