Answer:
Schedule 3911
Explanation:
Since in the question it is mentioned that isabella shifted from spain to the united states in the year 2019. She worked and filed form no 1040 for reporting her income. Now she received a letter regarding more information but she is not able to understand the letter so in order to request the information in spanish she use the schedule 3911. It is a statement that shows the refund status
So, the same is relevant