Why was repeated change of pastures necessary for the pastoral economy?

Correct answer: It gave animals continued fodder and allowed old pastures to recover

Pastoral economies depend on natural grasslands, so using one pasture continuously can reduce its vegetation and weaken the land. Moving herds between different grazing areas gives animals access to fresh fodder and prevents excessive pressure on a single place. A pasture that is left for some time can recover naturally, allowing grasses to regrow before animals return. This rotational pattern supports the health of both the herd and the grazing environment and is an important form of sustainable use of land.

Option A includes both benefits: continued food for animals and recovery time for old pastures. Changing locations did not make animals stop eating, permanently destroy every pasture, or cut pastoralists off from markets. Movement was a planned response to seasonal resources, not random wandering. By spreading grazing pressure across areas, pastoralists could maintain their livelihood over time. Therefore A is the correct explanation.