Yo me levanto a las seis de la mañana.
"me" is a reflexive pronoun in Spanish to clarify who is affected by the verb in a sentence. The reflexive pronouns in Spanish are "Me" for the subject "Yo", "Te" for the subject "Tu", "Se" for the subjects "Ella" "Él" and "Usted", "Nos" for the subject "Nosotros", "Os" for the subjects "Vosotros", and "Se" for the subjects "Ellos" and "Ustedes".
According to the above, the reflexive pronoun "me" should be used in the sentence presented because the subject is "Yo". So the correct answer is D.
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