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Which of the following is true regarding extinction?

AThe rate of extinction is steady from clade to clade as are the number of species contained within a clade.
BExtinction that occurs in a relatively short period of time is referred to as background extinction.
CSingle events or several causes working together to produce extinction in a short period is referred to as mass extinction.
DIf the rate of speciation in a clade is equal to or less than the rate of extinction, the clade will survive.

Verified Answer :

Neuron

The statement that is true here about extinction is 

C. Single events or several causes working together to produce extinction in a short period is referred to as mass extinction.

An example of this would be when one important event such as a meteorite hitting Earth further influences our planet by destroying habitable environment, polluting water, etc. 

All of this then causes a mass extinction because it's not habitable for multiple species anymore.

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