The United Nationʹs Human Development Report 2006) Ranked Norway First

The United Nationʹs Human Development Report 2006) ranked Norway first in its Human Development Index with GDP per person equal to $38,454. The United States , with GDP per person of $39,676, is ranked eighth. Which of the following could explain this ranking?

A) The United States has a higher population growth rate.
B) The United States has a lower unemployment rate than does Norway.
C) Norway has a lower GDP than the United State.
D) Other factors, like life expectancy and education are higher in Norway.