Arrange the following contributions to geographical thought in descending order of their influence during their respective times:
A. Carl Sauer's Cultural Landscape
B. Richard Hartshorne's Perspective on the Nature of Geography
C. Walter Christaller's Central Place Theory
D. Fred K. Schaefer's Exceptionalism in Geography
1
D, C, B, A
2
C, D, B, A
3
B, A, C, D
4
A, B, C, D