Final answer:
The correct form of estar to complete the sentence is están.
Step-by-step explanation:
The correct form of estar to complete the sentence is están.
When referring to Jorge and Ana, we use the third person plural form of estar, which is están. This is because Jorge and Ana are the subjects of the sentence and they are currently in the hallway studying before the exam.
Example: Jorge y Ana están en el pasillo estudiando antes del examen.
Learn more about Spanish verb conjugation