Final answer:
The correct form of the verb in the Presente de Subjuntivo is "duerma".
Step-by-step explanation:
The correct form of the verb in the Presente de Subjuntivo to complete the sentence is duerma. The sentence would be: "Espero que Carmen duerma por lo menos siete horas cada día." The verb "duerma" is the correct form to match with the subject "Carmen" and expresses the speaker's hope or desire.
Learn more about Spanish verb conjugation