Final answer:
The rapid growth of boom towns in the West during the late 1800s was primarily due to the C. discovery of valuable minerals.
Step-by-step explanation:
The rapid growth of boom towns in the American West during the late 1800s was spurred by mining discoveries, the expansion of the railroad, and economic opportunities. These towns, often characterized by a sudden surge in population, emerged as centers of commerce, attracting settlers seeking fortune and prosperity during the western frontier expansion.
This rapid growth of boom towns in the West during the late 1800s can be attributed to the discovery of valuable minerals. The mining industry, particularly the gold and silver rushes, attracted a large number of people to the western towns in search of wealth. The discovery of valuable minerals created economic opportunities and led to the development of thriving cities.