Which of the following approaches belong to in situ conservation of b…

The correct answer is Option (4) → (A), (B) and (D) only

In in situ conservation the living things are protected in their own natural habitat. In ex situ conservation threatened animals and plants are taken out of their natural habitat and kept in a special place where they get care.

(A) National parks — Correct. They are protected areas in the natural habitat, so this is in situ conservation.

(B) Biosphere reserves — Correct. They are also protected regions in the natural habitat.

(C) Wildlife safari parks — Incorrect. The animals are kept in a special setting outside their natural habitat, so this is ex situ conservation, like zoological parks and botanical gardens.

(D) Wildlife sanctuaries — Correct. They protect the animals in their natural habitat.

NCERT Extract:
How Do We Conserve Biodiversity? – “… In India, ecologically unique and biodiversity-rich regions are legally protected as biosphere reserves, national parks and sanctuaries. India now has 14 biosphere reserves, 90 national parks and 448 wildlife sanctuaries.”
How Do We Conserve Biodiversity? – “… Ex situ Conservation– In this approach, threatened animals and plants are taken out from their natural habitat and placed in special setting where they can be protected and given special care. Zoological parks, botanical gardens and wildlife safari parks serve this purpose.”