Which lines from the poem demonstrate the bluebird’s usefulness?
a. "oh then comes the bluebird, the herald of spring! / and hails with his warblings the charms of the season."
b. "he flits through the orchards, he visits each tree, / the red-flowering peach and the apple’s sweet blossoms;"
c. "he snaps up destroyers wherever they be, / and seizes the caitiffs that lurk in their bosoms;"
d. "the bluebird forsaken, yet true to his home, / still lingers, and looks for a milder tomorrow,"