Final answer:
The correct form of the verb ser to fill the blank in the sentence 'Nosotros, jóvenes' is C. éramos.
Step-by-step explanation:
The correct form of the verb ser to fill the blank in the sentence 'Nosotros, jóvenes' is C. éramos.
The verb ser is used to express identity and characteristics. In this sentence, éramos is the correct form because it agrees with the subject nosotros (we).
An example sentence using éramos can be 'Nosotros, jóvenes, éramos los mejores en el equipo de fútbol.'
Learn more about Spanish verbs