Arrange the following German school geographers in order of their birth years, earliest to latest:
(A) Oscar Peschel
(B) Ferdinand von Richthofen
(C) Alfred Hettner
(D) Friedrich Ratzel
1
A, C, D, B
2
B, A, C, D
3
C, B, A, D
4
A, B, D, C
Arrange the following German school geographers in order of their birth years, earliest to latest:
(A) Oscar Peschel
(B) Ferdinand von Richthofen
(C) Alfred Hettner
(D) Friedrich Ratzel