A metaphor is a speech device that compares one object to another object using words that associate them. In this case, the lines that use this literary device is A which compares hemisphere as the master of its own house.
A! DDT is sprayed all over the county
The answer you are looking for is A
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If a speaker were preparing a speech for the city council the style they should go for would be formal, educational, serious, or an informative tone.