Grasslands can form under which conditions?

Correct answer: Where rainfall is enough for grass but low for dense forests

The direct answer is A: grasslands can form where rainfall is enough for grass but not enough for dense forests. Vegetation depends greatly on water, temperature, soil and sunlight. Step by step: if rainfall is moderate, grasses can receive enough moisture; if rainfall is not high enough for many large trees, a thick forest does not develop; grasses then dominate the open land. Option A is correct because it connects rainfall with the type of vegetation. Option B is wrong because permanent snow leaves too little usable warmth and growing time for ordinary grasslands. Option C is wrong because plants need some soil for roots, water and nutrients. Option D is wrong because a saline sea is not a grassland environment. Exam cue: moderate rainfall often supports grasslands; very high rainfall may support dense forests, while very low rainfall may produce deserts.