question: factor of production:land:capital
choices.label: A B C D
choices.text: natural phenomenon:rainbow:desert social welfare:social insurance:social assistance oil crops:peanut:rice market research:product raw materials:customer feedback
explanation: "factors of production" refer to various social resources required for social production and business activities, including four categories of labor force, "capital", "land" and entrepreneurial ability. both "capital" and "land" belong to "factors of production" . "desert" is a landform, not a "natural phenomenon", and "rainbow" is a kind of "natural phenomenon". "social welfare" generally includes cash assistance and direct services. cash assistance includes "social insurance", "social assistance" and income subsidies. both "social insurance" and "social assistance" belong to "social welfare". "peanut" is an "oil crop", but "rice" is not an "oil crop". common "market research" includes consumer surveys, market observations, product surveys, and advertising research, excluding "product raw materials" and "customer feedback
relation: land capital R2.4
relation: rainbow natural phenomenon R2.2