Final answer:
c) Intensive. Intensive agriculture involves the cultivation of small land holdings through a high expenditure of labor per acre to produce high yields per unit and support high population densities.
Step-by-step explanation:
_______ subsistence agriculture involves the cultivation of small land holdings through the expenditure of great amounts of labor per acre. Yields per unit and population densities are both high.
The correct answer to this question is Intensive agriculture. In intensive agriculture, farmers use labor-intensive methods such as plowing, terracing, and irrigation to farm the same plot of land repeatedly. This method results in high yields per unit and supports high population densities.