​The American Indian Population Experienced a _________, Largely Due to __________

​The American Indian population experienced a _________, largely due to __________.

A) ​twentieth-century boom; a sudden decline in group poverty
B) twentieth-century boom; government programs designed to restore it to prominence
C) ​catastrophic collapse; diseases brought over from Europe
D) ​catastrophic collapse; war between the various Indian nations
E) ​None of these choices is true.