Which underlined word in the sentence is a plural common noun?

the zoo has animals native to our state and a special exhibit from africa.

a.
exhibit

b.
africa

c.
state

d.
animals

The difference between the present reservoir, with its silent sterile shores and debris-choked side canyons, and the original glen canyon, is the difference between death and life. glen canyon was alive. lake powell is a graveyard. which word best contributes to the author’s sad tone?