First quarter of 20th century was to be considered as the golden age of German geography. Among the following, who were the great leaders of this period?(i) A. Penck(ii) H. Lautensach(iii) C. Ritter(iv) A. Hettner

• A. (i) and (iii) are correct.
• B. (iii) and (iv) are correct.
• C. (i) and (iv) are correct.
• D. (i), (ii) and (iii) are correct.