Brian was a soldier. he just got word that he was called back to active service. He'd have to do what soon?\nOptions:\n- report for duty\n- wait for orders\n- fight for freedom\n- obay\n- receive orders
Let's be accurate as possible. Think before you answer.
report for duty
A person has to report for duty when he is at service.

As he was called back to active service so he'd have to report for duty.

.

The answer: report for duty