The correct answer is the following.
The question asks us to match the vocabulary term with its meaning.
1) clan: a tribe or band of people, usually related.
2) nomadic: describes the life of wandering from place to place.
3) pastoral: a life of tending livestock in open pasture land.
4) steppe: a vast, semi-arid grassy plain.
These terms refer to a moment in the developing of human societies when early humans stopped being nomads; from wandering and roaming throughout the land following animals to hunt them in order to feed their families, to settle in a territory when they learned agriculture techniques. Once installed in a territory, they also domesticated animals and started to develop a sense of community, such as the Sumerians that develop city-states.