What is the primary difference between a developing economy and an underdeveloped economy? a. nothing; the two terms are synonymous b. developing economies have a low level of development, but are on the development road; underdeveloped economies have low levels of development and are not on the development road c. underdeveloped economies have a low level of development, but are on the development road; developing economies have low levels of development and are not on the development road d. developing economies all have real GDP growth rates that are higher than their nominal GDP growth rates; underdeveloped economies do not e. underdeveloped economies all have real GDP growth rates that are higher than their nominal GDP growth rates; developing economies do not