TOEFL Reading: ETS-TOEFL阅读机经 - A73W35ZZWPC15K09L$

In paragraph 1, the author makes the point that the relocations of rats and the kumara to new environments differed in A. whether or not humans planned to transfer these species to a new environment B. how far these species had to be transported to arrive at the new environment C. how difficult it was for these species to become established in the new environment D. whether or not these species succeeded in the new environment