Question

the us population grew during the gilded age mainly because of
the need for skilled laborers.
the growth of agriculture.
a decline in settlement of the west.
a sharp rise in immigration.

Explanation:

During the Gilded Age (late 19th century), the US population grew significantly mainly due to a sharp rise in immigration. Many people from Europe and other regions came to the US seeking economic opportunities, especially with the growth of industrialization. The need for skilled laborers was part of industrial growth but not the main population growth driver. Agriculture growth was not the primary reason for overall population growth, and settlement of the West was increasing, not declining. So the correct option is the one about a sharp rise in immigration.

Answer:

D. a sharp rise in immigration.