योग्य जोड्या जुळवा.
भौगोलिक विचारवंत
a. रैटझेल
b. कार्ल रिटर
c. कु. एलन सेंम्पल
d. कार्ल सॉएर

ग्रंथ
i. सांस्कृतिक भूगोल
ii. भौगोलिक पर्यावरणाचा प्रभाव
c. मानववंशाचा इतिहास
d. अर्डकुन्डे

The correct answer is Option B (a-iii, b-iv, c-ii, d-i).

Key Points:
• Eminent Geographers and Landmark Treatises:
• Friedrich Ratzel (a -> iii): Pioneer of human and political geography; authored the anthropological work 'Völkerkunde' (मानववंशाचा इतिहास - 1885) and *Anthropogeographie*.
• Carl Ritter (b -> iv): Co-founder of modern geographic science; wrote the masterwork 'Erdkunde' (१९ खंड) examining the earth in relation to human development.
• Ellen Churchill Semple (c -> ii): Leading American environmental determinist; authored 'Influences of Geographic Environment' (१९११).
• Carl O. Sauer (d -> i): Father of cultural geography; authored seminal texts establishing 'Cultural Geography' and the concept of Cultural Landscape (1925).
• Matching Sequence: a-iii, b-iv, c-ii, d-i (Option 2).
• Key Takeaway: Ratzel wrote 'Volkerkunde', Carl Ritter 'Erdkunde', Ellen Semple 'Influences of Geographic Environment', and Sauer 'Cultural Geography'.