Final answer:
The appropriate form of the verb 'ir' to fill in the blank is 'vamos'
Step-by-step explanation:
The correct answer to fill in the blank is B. vamos.
Ir is the Spanish verb that means 'to go'. In this sentence, the subject 'nosotros' (we) indicates that the appropriate form of the verb 'ir' should be in the first person plural, which is 'vamos'.
For example, 'Hoy, nosotros vamos a la fiesta de Sergio' means 'Today, we are going to Sergio's party'.
Learn more about Spanish Verbs