Final answer:
The correct verb form is 'ha llegado'.
Step-by-step explanation:
The correct verb form for the sentence is ha llegado. This form is used to indicate that Andrés has not arrived yet. The verb form han llegado is plural and would be used when referring to multiple people who have arrived. The verb form hemos llegado is first-person plural and would be used when the speaker and other people have arrived. Therefore, the correct verb form for this sentence is ha llegado.
Learn more about Spanish verb forms