Which of the following statements best describes the changes in american cities from 1900 to 2000?

a.
during the early 1900s, the populations of us cities located in the south were the highest, but by 2000, these populations began to decline as people began to move to cities on the east coast.
b.
during the early 1900s, the populations of us cities located on the west coast were the highest, but by 2000, the populations of cities located in the midwest became greater than those of the east coast.
c.
during the early 1900s, the populations of us cities located on the east coast were the highest, but by 2000, these populations began to decline as people began to move to cities on the west coast.

d.
during the early 1900s, the populations of us cities located in the midwest were the highest, but by 2000, the populations of cities located in the west became greater than those of the midwest.