Final answer:
The correct form of the verb 'poder' to fill in the blank is 'podemos'.
Step-by-step explanation:
The correct answer is D. podemos.
The verb poder means 'to be able to' in English. In this sentence, 'Nosotros podemos estudiar esta noche' translates to 'We can study tonight'.
Here, 'nosotros' is the subject pronoun for 'we'. The verb 'podemos' is the first-person plural form of the verb 'poder'.
Learn more about Spanish verb conjugation