If another stanza were added to “The Caged Bird,” which excerpt could best be used to continue the extended metaphor?

The free bird sings
with a joyous song
of the captive life
that kept it safe all along

The caged bird sings
with a fearful trill
of things it craves
outside the sill

The free bird sings
with a fearful trill
of things it craves
outside the sill

The caged bird sings
with a joyous song
of the captive life
that kept it safe all along