The SunBelt is a region defined by warm climate of the United States. Is not a political example although this region coincide with a very fast growing economy and population for the last decades.
Corect answer is C - a formal example
<span>The country of Indonesia consists of a vast chain of more than fifteen thousand islands stretching about three thousand miles from east to west. </span>
Doldrums are caused by solar radiation from the sun. Because of this the sunlight beams warms the air and causes it to rise straight up instead of side to side (horizontally).
Because of all the industry they have there. Also because of all the mountains and how little space they have due to the huge population of Japan.