Final answer:
The correct verb to complete the sentence is 'están', which means 'are' in English.
Step-by-step explanation:
The correct verb to complete the sentence is están, which means 'are' in English.
So, the correct sentence would be:
Los presidentes de algunas naciones latinoamericanas están en una reunión.
This sentence is in the present tense, indicating that the presidents of some Latin American nations are currently in a meeting.
Learn more about Spanish verb conjugation