In Scotland, the number of wild salmon have been reduced because of uncontrolled deep-sea and coastal netting, by pollution, and by various other threats to the fish’s habitat.
A. number of wild salmon have been reduced because of uncontrolled deep-sea and coastal netting
B. number of wild salmon is reduced because deep-sea and coastal netting is not controlled
C. numbers of wild salmon has been reduced because of uncontrolled deep-sea and coastal netting
D. wild salmon’s numbers are reduced by deep-sea and coastal netting that is not controlled
E. wild salmon’s numbers have been reduced by uncontrolled deep-sea and coastal netting
这题考点是什么？答案怎么是E？
只见过the number of numbers of ，the wild salmon’s numbers have been 感觉好奇怪？ | 
