Answer:
a. True.
Step-by-step explanation:
The F-1 immigration status visa allows a foreigner like Hans to pursue academic studies in the United States.
It is important to note that an F-1 status holders can work legally and earn income on-campus, through scholarships etc, and are therefore mandated to file tax returns reporting all such income and pay taxes on it.
Since Hans arrived in the United States for the first time, he can file as nonresidents for tax purposes.