The Current Rate of Extinction Is Between _____ and _____

The current rate of extinction is between _____ and _____ times the rate that existed before humans arrived on Earth.

A) 5 and 10
B) 10 and 100
C) 100 and 1,000
D) The rate is the same as it was before humans arrived on earth.
E) There is no way to determine the extinction rate before humans arrived on earth, so these numbers cannot be estimated or compared.