The phrases “airtight cage of poverty” and “ominous clouds of inferiority” can best be defined as metaphors.
What is a metaphor?
Using a word or phrase to describe something that it is not literally related to is known as a metaphor.
Luther King Jr. compares two unlike things with each other that is "airtight cage" with "poverty", and "ominous clouds" with "inferiority" that have nothing in common. A cage is compared with poverty that lock up the poor people. It's critical to comprehend how well this picture of entrapment still captures the lives of the working poor as they struggle to make ends meet for their families.
The ominous clouds are compared with inferiority as dark clouds represent subjection. Luther King Jr. chose a young innocent child and recounts how the "ominous clouds of inferiority [begin] to develop in her little mental sky" to provide the audience with an element that is familiar to most people, one that is innocent and sweet and that ordinary humans might loathe to see ruined.
Hence, the correct option is B.
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