All of the following are true of the Zebra mussels found in the Great Lakes EXCEPT:

AZebra mussels are having are having a negative impact on the native population of mussels in the region.
BThey were unintentionally introduced to the Great Lakes by humans.
CZebra mussels have caused a great deal of environmental damage to the area.
DPeople of the Great Lake region are benefitting from the economic advantages of having zebra mussels in the region.