Why was descending from high mountains in winter necessary for pastoralists?

Correct answer: Because snow and cold at high altitudes became a crisis for animals

The direct answer is A: winter snow and severe cold at high altitudes could threaten livestock, so pastoralists descended. High mountain pastures may be useful in warmer months, but winter changes the conditions: snow covers grass, water may freeze, travel becomes difficult and animals may become weak or die. The reasoning is seasonal: warm months permit grazing at higher elevations; winter makes those places unsafe; lower areas are comparatively more accessible and suitable. Option A is correct because it connects descent with animal safety and food access. B is wrong because the presence of the sea is not the reason. C is wrong because animals still need food and protection in cold weather. D is wrong because pastoralists were moving with livestock, not permanently taking city jobs. Memory cue: high summer pastures, low winter shelter.