Africa's black rhino population in the mid-1970's numbered about 20,000, ten times the estimated population of 2,000 in 1997.
(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
...
(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
Subject is the population, option B, D and E are out because they are refering to rhinos as subject.Option C is out because it is wrongly constructed also distorts the meaning.
We
...






