Final answer:
The verb that completes the sentence is 'contribuyeron.'
Step-by-step explanation:
The correct verb that completes the sentence is contribuyeron. It agrees with the subject, Antonio José de Sucre y Francisco de Miranda, which is plural. The verb contribuyeron is the third-person plural form of the verb contribuir, which means 'to contribute' in English. This verb is used to indicate that both Antonio José de Sucre and Francisco de Miranda contributed to the liberation of South America from Spain.
Learn more about Verb completion in Spanish