Answer:
C. Nonfarm labor was becoming more common.
Explanation:
After 1790, there was a rise of highly productive agricultural regions in the United States, which counted on cheap, handy transport that helped them approach different markets. In this way, farms provided urban populations, foreign countries and little towns with their products. These little towns supplied farmers with good and services, and this is how nonfarm labor began to increase, eventually leading to industrialization in the U.S.