National parks and sanctuaries are established for the purpose of:
Explanation
Option (D) is correct because the context states that national parks and sanctuaries are established under the Wild Life (Protection) Act, 1972, specifically to protect, preserve and propagate the variety of species within natural boundaries. These areas are described as in situ conservation efforts where endangered species are safeguarded in their natural habitats, rather than for recreation, hunting, or keeping pets.
Solution Steps
Step 1: Identify the purpose of national parks and sanctuaries from the text. The text states they were established to 'protect, preserve and propagate the variety of species within natural boundaries'.
Step 2: Relate this purpose to the given options. Protecting, preserving, and propagating species defines 'Conservation'.
Step 3: Conclude that the correct option is (D).