What concept does the term heteroglossia describe?

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A baby's lack of speech ability before the mirror stageThe connections between symbols, signifiers, and signsThe presence of multiple layers of language within a literary textThe patterned transition between political and economic topics

Explanation

Option A refers to an infant's speech development stage, which is unrelated. Option B deals with symbolic relationships but does not define heteroglossia. Option C correctly identifies heteroglossia as the coexistence of diverse voices and language layers in literature. Option D describes thematic shifts that are not connected to the concept.