Answer: C. Specialize and divide labor
Explanation: The very emergence of civilizations is linked to the fertile river valleys that enabled the development of agriculture and the strengthening of the civilizations thus formed. Further, suitable sea coasts have contributed to the development of fishing and maritime trade. Different goods could be exchanged and civilization grew and became rich. A key factor with further development occurred when division and specialization of labor made production more efficient, faster, and therefore more profitable. Specialization and division of labor mean division of responsibilities and training for specialized jobs, each focusing on specific production activities, which all together make for a more efficient whole. This was particularly pronounced and proved to be true much later, with the emergence of free market ideas, the basic premise of which was division and specialization of labor.
