Answer:
C) the agricultural sector.
Explanation:
The agricultural sector is the one that deals with the production of food in farms and other rural areas. This is the sector of the American economy that would have been impacted most by the developments listed in the timeline. The mechanical reaper, the steel plow and the gasoline-powered tractor all improved the way the land was worked, making the work easier and more efficient. On the other hand, refrigeration techniques ensured that food lasted longer.
