Final answer:
These photographs reflect a change in the U.S. economy by showing how factory production evolved and became more efficient through scientific management and mass production. Therefore, the correct option is C.
Step-by-step explanation:
These photographs reflect a change in the U.S. economy by showing how factory production evolved and how the manufacturing of consumer goods became more efficient and specialized.
Photographs depicting workers on assembly lines and completing only one or two steps in the manufacturing process demonstrate the use of scientific management and mass production, which increased the availability of consumer products.
This change in manufacturing process allowed for the production of more finished goods with greater efficiency and speed, thus reflecting a transformation in the U.S. economy.