Match List-I with List-II and choose the correct answer using the codes given below the lists :
List-I
A. Planting Hearth
B. Cryophyte Steppe
C. World Floral Regions
D. Puszta Grassland
List-II
1. Hungary
2. Adolf Engler
3. C.O. Sauer
4. Arctic Tundra
Codes :
   A B C D

The correct matching is as follows:

• Planting Hearth (C.O. Sauer): Carl O. Sauer, a famous geographer, proposed the concept of agricultural "hearths" in his work on the origins of agriculture, suggesting that vegetative planting originated in specific tropical regions.
• Cryophyte Steppe (Arctic Tundra): Cryophytes are plants adapted to extremely cold environments. The Arctic Tundra is a biome characterized by such cold-resistant vegetation.
• World Floral Regions (Adolf Engler): Adolf Engler was a German botanist who pioneered the classification of the world into distinct floral regions or phytogeographic kingdoms.
• Puszta Grassland (Hungary): The Puszta is a temperate grassland (steppe) region located in the Great Hungarian Plain of Hungary.

Therefore, the correct sequence is A-3, B-4, C-2, D-1.