What change might pastoralists have to make in their herds when pastures shrank?

Correct answer: Sell some animals or reduce herd size

The direct answer is B: when pastures shrank, pastoralists might sell some animals or reduce the size of their herds. Herd size must match the amount of available fodder and water. Step by step, less pasture means less food for animals; a large herd then becomes expensive or unhealthy to maintain; the pastoralist may sell some animals, keep fewer animals, or change the type and movement of the herd. Option B is correct because it is a practical adjustment to reduced grazing resources. Option A is wrong because doubling the herd would increase pressure on already scarce pasture and could cause animal weakness or loss. Option C is wrong because tax status does not solve the shortage of grass and water; taxation and herd management are separate issues. Option D is wrong because making forests private is not a herd-management response and is generally a legal or land-control decision, not something an individual pastoralist can simply do. Remember the resource rule: less fodder generally requires a smaller or differently managed herd.