The correct options are
A Slash and burn farming
B Nomadic herding
Primitive subsistence agriculture can be classified into two types
1) Shifting, or slash and burn farming
2)Nomadic herding.
Slash and burn farming involves cutting down trees and plants and setting them on fire to cultivate on the land. Nomadic herding is the practice of herding livestock and moving from one place to another along with livestock in search of pasture or favourable climatic conditions.