Biologists attached a radio transmitter to one of a number of wolves that had been
released earlier in the White River Wilderness Area as part of a relocation project.
The biologists hoped to use this wolf to track the movements of the whole pack.
Wolves usually range over a wide area in search of prey, and frequently follow the
migrations of their prey animals. The biologists were surprised to find that this
particular wolf never moved more than five miles away from the location in which it
was first tagged.
Which one of the following, if true, would by itself most help to explain the behavior
of the wolf tagged by the biologists?
a. The area in which the wolves were released was rocky and mountainous, in
contrast to the flat, heavily-wooded area from which they were taken.
b. The wolf had been tagged and released by the biologists only three miles away
from a sheep ranch that provided a large, stable population of prey animals.
c. The White River Wilderness Area had supported a population of wolves in past
years, but they had been hunted to extinction.
d. Although the wolves in the White River Wilderness Area were under government
protection, their numbers had been sharply reduced, within a few years of their
release, by illegal hunting.
e. The wolf captured and tagged by the biologists had split off from the main pack
whose movements the biologists had hoped to study, and its movements did not
represent those of the main pack. Bottom of Form

which option is correct?