What is the strongest basis for treating pastoral mobility as environmental adaptation?

Correct answer: They organised life according to changing distribution of resources

The direct answer is A: pastoral mobility is environmental adaptation because pastoralists organised their lives according to the changing distribution of grass, water, and other resources. Pastoralists depend heavily on animals, and animals need food and water throughout the year. These resources are not equally available in every place or season. The reasoning is step by step: weather changes; grass and water become plentiful in some areas and scarce in others; pastoralists observe these conditions; they move with their herds to suitable places; the animals remain healthy and the livelihood continues. Such movement is purposeful, not random. It is a practical response to the environment. Option A is correct because it directly connects movement with changing resource distribution. Option B is wrong because pastoralists’ movement was closely connected with their animals; travelling without animals does not explain pastoral mobility. Option C is wrong because seasonal movement usually means that people do not remain in one place throughout the year. Option D is wrong because observing pasture conditions was essential for deciding when and where to move. The basic concept is adaptation: people adjust their practices to natural conditions so that life and work can continue. Exam cue: when movement follows grass, water, weather, or seasons, think “environmental adaptation.”