12 Virgin soil epidemics contributed to an unbelievable decline in the population of native inhabitants of the Americas, one that has been estimated at as much as an 80 percent decrease of the native population in the centuries following the arrival of Europeans in the Americas.
A a virgin soil epidemic
B an unbelievable decline of native inhabitants
C the population of native inhabitants
D the arrival of Europeans.
该题问“one”指代什么?正确答案为B,为什么不选C呢?