The Present Rate of Species Loss on Earth May Be

The present rate of species loss on Earth may be as high as 20,000 species lost per year. At this rate by the year 2050 one-third of the world's species could be lost, many of which have not even been discovered. Never before has a single species, humans, been responsible for the loss of so many species. Based on this information, what is the best conclusion?

A) Extinctions occur for natural reasons. People need to accept this is part of nature and allow nature to take its course.
B) Since species can recover in a short time period, Earth is experiencing a fairly normal trend.
C) Due to the given data, the Earth may be facing another large extinction event.
D) Humans need to invest more time and money into science to discover and name the species before they die off.
E) It is natural for one species to dominate the planet and is no cause for concern.