Which of these is the most likely explanation for the information depicted in the map?
a) ohio was not admitted to the union until 1870
b) people were migrating from southern to northern states.
c) western expansion spread the u. s. population over a wider area.
d) the world wars resulted in dramatic population shifts in the u. s.

Data courtesy of the un development programme 2006-2008 and world bank 2009 the chart above compares measures of development using the hdi and gdp. why might turkey rank lower in the hdi indicator even though it has a high gdp? a. turkey has a lower gdp than comparable countries in the hdi ranking. b. turkey must increase its hdi to have a higher gdp ranking. c. turkey is only compared to other european countries in gdp, not to the world, as it is in the hdi. d. turkey may struggle to provide adequate education or health care, or it may have a lower life expectancy.