Currently where are we in the cycle of biodiversity?

A. beginning of mass extinction

B. middle of mass extinction

C. near the end of mass extinction

We are currently undergoing a process of mass extinction - it is called the Holocene extinction, and it has started around 10 000 BCE (so we reject the answer A).

However, the end of mass extinction is not something we predict, instead, we predict that this mass extinction will continue, so the correct answer is

B. middle of mass extinction