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A. Subsistence farming

Explanation:

Subsistence farming is when farmers farm for their friends and family in a small village.

Hydroponic farming is when plants are not put in soil, but just rich-nutrient water.

Commercial farming is basically for animals, and sold to markets.

Slash and burn farming sounds exactly what it is, burning and cutting plants to create a field.

d. stage 4

explanation:

the existence of some kind of demographic transition is widely accepted in the social sciences because of the well-established historical correlation linking dropping fertility to social and economic development.[1] scholars debate whether industrialization and higher incomes lead to lower population, or whether lower populations lead to industrialization and higher incomes. scholars also debate to what extent various proposed and sometimes inter-related factors such as higher per capita income,lower mortality, old-age security, and rise of demand for human capital are involved.[2]

baltic states. baltic states, northeastern region of europe containing the countries of estonia, latvia, and lithuania, on the eastern shores of the baltic sea.

explanation: