The word "inhabitants" (in the fifth paragraph) refers to ______.
A) animal welfare grounds C) collections
B) prisons D) areas where zoos are built

A．Zoos provided inadequate entertainment for people.
B．Zoos were not aware of a responsibility to prove their collections right in regard to its importance for science, conservation and popular education.
C．Zoos paid so much attention to the benefit their collections brought that they ignored the needs of animals.
D．Zoos didn't bring their commercial potentialities into full play.

A．An important new role has evolved for good zoos: they are not prisons for animals but reservoirs of species.
B．Zoos should learn to justify their existence no matter how great the pressure is.
C．Criticism on zoos ought to be more specific because zoos are not graded on the same level.
D．The function of education of zoos becomes more important and practical.