Answer: A) It compares people to land masses, and when one clod is washed away it lessens the continent; this develops the theme of connection between individuals as parts of a whole.
Explanation: The poem makes a comparison of people with land masses. In the line "If a clod be washed away by the sea, Europe is the less" the author is implying that caring for others makes a strong bond. If a man perishes, the people around him suffer, and the world loses a part of it. The author's message is to make the reader acknowledge how important we are to one another, and never take life for granted.