Every sentence must have at least one main clause. A main clause contains an independent subject and a verbal structure and expresses a complete thought. A fragment occurs when you neglect to insert a main clause somewhere between the capital letter at the beginning and the end mark concluding the word group.
The sentence containing the fragment is:
B. Our dog loves to retrieve sticks. He will beg you to throw them for hours. Even if it's clear that he is exhausted.
The exact Fragment is: <em>Even if it's clear that he is exhausted.</em>
The poem 'Harlem' is an example of free verse. The meter is irregular and there is also an irregular rhyme scheme (2nd line rhyme with 4th, 5th with 7th and 9th with 10th)