Final answer:
The word that best completes the sentence is 'ir'.
Step-by-step explanation:
The word that best completes the sentence is ir. The correct option is D. ir. This is because ir means 'to go' in Spanish, and it matches the subject 'Yo' (which means 'I'). The correct sentence is 'Yo no quiero ir a la escuela hoy', which translates to 'I don't want to go to school today'.
Learn more about Completing a sentence in Spanish