In which situation does a species need special conservation?

Correct answer: When its number is decreasing rapidly

The direct answer is A: a species needs special conservation when its number is decreasing rapidly. A rapid fall is a warning that deaths, habitat loss, pollution, disease, climate stress, invasive species or hunting may be greater than reproduction. The correct response is to identify the cause, protect the habitat, stop harmful activities and monitor recovery. Option A is correct because a declining population faces a real risk of becoming endangered or extinct. Option B is wrong because a species abundant everywhere generally does not face the same immediate scarcity risk, although it may still need normal management. Option C is wrong because a safe habitat lowers, rather than increases, the need for special protection. Option D is wrong because absence of hunting alone does not prove that every other threat is absent. Memory cue: rapid decline means act before disappearance.