Spengler's Historical Theories Drew Attention Because They

Spengler's historical theories drew attention because they

A) confirmed liberal confidence in western progress and expansion.
B) failed to explain the chaos and absurdity of World War I.
C) suggested that western civilization had fallen into decay and crisis, thus contradicting liberal confidence in western progress and expansion.
D) drew upon cyclical theories of life and death, and suggested that the west was entering its creative middle passage after its energetic youth.