To solve this question, we need to match each animal or bird with the Wildlife Sanctuary, National Park, or region where they are naturally found. Let's review the options provided:
- Great Indian Bustard: This bird is typically found in arid and semi-arid grasslands. The Desert National Park in Rajasthan is a well-known habitat for the Great Indian Bustard. Therefore, it should be matched with 3. Desert National Park.
- Megapode: The Nicobar Megapode is a ground-dwelling bird found on the islands of the Nicobar Archipelago. Hence, it should be matched with 4. Nicobar Island Sanctuary.
- Jerdon's Courser: This is a nocturnal bird found in the dry deciduous forests of the Sri Lankamalleswara region. Therefore, it should be matched with 2. Sri Lankamalleswara Wildlife Sanctuary.
- Pigmy Hog: This is a critically endangered wild pig found in the grasslands of Assam, particularly in the Manas National Park. Hence, it should be matched with 1. Manas National Park.
Using this information, the correct matching option is A3, B4, C2, D1.
Let's justify and eliminate the other options:
- A2, B3, C4, D1: The Great Indian Bustard is not found in the Sri Lankamalleswara Wildlife Sanctuary, eliminating this option.
- A2, B4, C1, D3: Jerdon's Courser is not found in Manas National Park, hence incorrect.
- A1, B4, C3, D2: The Great Indian Bustard is incorrectly matched, making this option invalid.
- A4, B3, C1, D2 : The Nicobar Megapode is mistakenly matched with Desert National Park.
- A3, B4, C2, D1: This matches correctly as discussed in the solution.
Thus, the correct answer is A3, B4, C2, D1.