Blahdenburg’s population of flutterfish declined in the past decade, mainly because of the harmful runoff from a local factory. These fish are the primary food source of the hamrat, a medium-sized species of rodent whose numbers had suffered along with their prey’s. Yet although the factory was shut down a few years ago, the population of hamrats has continued to decline.
Which of the following, if true, most helps to explain the continued decline in the hamrat population?
【选项】
The factory had altered the flow of the river, and now that it has been shut down, the flutterfish spawn in a different region.
选项是否正确？