If there is no buffer zone around a sanctuary which problem may increase?

Correct answer: External human pressure may directly affect the habitat

The direct answer is A: External human pressure may directly affect the habitat. A buffer zone is a surrounding area that separates or softens the effect of activities outside a protected core area. It can help regulate traffic, settlement, farming, grazing, resource collection and other disturbances. Without it, people and development may come close to the sanctuary boundary, so noise, pollution, habitat damage and conflict can affect wildlife more directly. Option A is correct because it states the main risk. Option B is wrong: removing a protective layer does not give wildlife more peace. Option C is wrong because illegal hunting does not stop automatically; it requires enforcement and monitoring. Option D is wrong because habitat cannot expand automatically merely because a buffer is absent. A buffer is not a complete solution, but it is an important protective transition zone. Memory cue: core area is the safe centre; buffer zone is the protective cushion around it.