Final answer:
The correct preterite form of the verb construir is 'construyeron'.
Step-by-step explanation:
The correct option is OA. construyeron. In this sentence, we need to choose the preterite form of the verb construir that agrees with the subject 'Los trabajadores', which is a plural noun. The preterite form 'construyeron' is the correct choice because it reflects the past action of the workers building a new building.
Learn more about Conjugation of the verb construir in the preterite tense