Final answer:
The word that best completes the sentence is 'Dales'. It means 'give them' in Spanish.
Step-by-step explanation:
The word that best completes the sentence isB. Dales.
The sentence, "Mi examen es mañana. Dales tus notas, por favor!", translates to: "My exam is tomorrow. Give them your notes, please!"
In this context, "dales" is the correct form of the verb "dar" (to give) in the second person plural form, and it agrees with the subject "tus notas" (your notes).
Learn more about Word completion in Spanish