In Maya Angelou's poem the caged bird sings to express itself, since it is its only choice while it remains trapped in a cage, as stated in option C.
Maya Angelou's poem "The Caged Bird" is about two birds, one free and one caged. The birds function as an extended metaphor, representing people who are free and have rights and those who are not and do not, respectively.
The caged bird sings, even though it cannot go anywhere or see anything. It sings to express itself and its longing for the free life that it does not have.
With the information above in mind, we can select option C as the correct answer.
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