The given answer doesn't match up with the reference material. The question reads:
...what costs do you incur for querying the data stored in Azure?
From the linked reference:
Stretch Database bills Compute and Storage separately so you only pay for what you use.
Note: storage transactions are not billed; customers only pay for data stored, not storage transactions.
There is no Network Transfer pricing on the linked reference, but:
Outbound data transfers are charged at regular data transfer rates.
Based on those, I'd say the correct answers are Compute and Data Transfer.
You're charged the Storage cost for storing the data, not for querying it; you're not charged a Storage Transaction cost for querying it; and there is no Network Transfer cost.