Which of the Following Statements About Extinction Is TRUE

Which of the following statements about extinction is TRUE?

A) Overexploitation by hunting and fishing is the major threat to tropical animals and plants.
B) Without human activity, all species would survive and there would be no extinctions.
C) Endangered wild species often become extinct due to different combinations of factors.
D) Commercial hunting and fishing are careful not to deplete animal reserves.
E) Introduction of new exotic species helps preserve biodiversity and slow extinction.