Which data support the statement "The planet is on the brink of a large extinction, much like the dinosaurs."?

A) The present rate of species loss may be as high as 20,000 species lost per year. If biodiversity loss continues at this rate, by the year 2050 one-third of all of the world's species could be lost.
B) By 2050, 20,000 species living today will be extinct.
C) Biodiversity loss is occurring at an alarming rate of 2,000 species a day.
D) The present rate of species loss is very high and this will cause major extinction of all of the keystone species.
E) This type of statement cannot be supported.