I think the common noun is family and circus.
The answer is C, because he is implying that we can't just hope the problems go away.
On top of a mountain
or under a sea
there are so many places
where creatures can be
Alone on a dessert
or grouped in a farm
or tucked in a tree trunk
away from all harm
on bright sunny grasslands
or in a dark cave
in jungles and forests
where all must be brave
on ice in the artic
or holed underground
there are so many places
where creatures are found
