And when we struggle to retain a handful of Californian condors or whooping cranes, it’s clearly not from a fear of ecological collapse, it’s because there is something obscene and frightening about the disappearance of another species at our hands.What does “the disappearance of another species at our hands” mean?

A. In the modern era, we are directly responsible for the extinction of endangered species.
B. We directly kill other species, causing their extinction.
C. We make other species disappeared.
D. We witness the disappearance of other species.