Regarding the scope of human geography, consider the following statements:

A) Strabo and Aristotle were among the early Greek scholars who emphasized the relationship between man and the physical environment.
B) Ibn-a-Khaldun was the only Arab scholar who contributed to understanding cultural characteristics.
C) Humboldt and Ritter focused on social groups’ relationship with the physical environment.
D) Ritter believed that earth and its inhabitants share a reciprocal relationship.

Select the correct statements: