The most important strategy for the conservation of biodiversity together with traditional human life is the establishment of

The most important strategy for the conservation of biodiversity…

Answer

(a) Biosphere reserves: These are meant to conserve biodiversity along with traditional lifestyles and sustainable human use through core, buffer, and transition zones. Verdict: Correct.
(b) Botanical gardens: They conserve plant species ex-situ, but they are not the main strategy for conserving biodiversity together with human life systems. Verdict: Incorrect.
(c) National parks: These are strict protected areas where human activity and habitation are generally not allowed. Verdict: Incorrect.
(d) Wildlife sanctuaries: They protect wildlife, but they are not specifically designed to integrate biodiversity conservation with traditional human life as biosphere reserves are. Verdict: Incorrect.