<span>The sea is a hungry dog,Giant and grey.He rolls on the beach all day.With his clashing teeth and shaggy jawsHour upon hour he gnawsThe rumbling, tumbling stones,And 'Bones, bones, bones, bones! 'The giant sea-dog moans,Licking his greasy paws.And when the night wind roarsAnd the moon rocks in the stormy cloud,He bounds to his feet and snuffs and sniffs,Shaking his wet sides over the cliffs,And howls and hollos long and loud.But on quiet days in May or June,When even the grasses on the dunePlay no more their reedy tune,With his head between his pawsHe lies on the sandy shores,So quiet, so quiet, he scarcely snores.</span>
I'd say the answer is B, 'then soared to the uttermost reaches' - birds soar when they fly high, and it flies 'to the uttermost reaches', which clearly refers to a bird.
