Africa's black rhino population in the mid-1970's numbered about 20,000, ten times the estimated population of 2,000 in

Africa's black rhino population in the mid-1970's numbered about 20,000, ten times the estimated population of 2,000 in 1997.

(A) the estimated population
(B) that of their estimated population
(C) more than the population's estimated amount
(D) more black rhinos than their population estimate
(E) more than that of their population's estimated amount


OA A

Source: GMAT Prep