The correct answer is C) Huns.
The Visigoths warred with the Huns, another invading tribe.
The Goths were people from the Germanic territories around the 3rd century CE. The Visigoths were Goths from the western territories. They settled in what today is part of Germany and Hungary and wage war with the Huns for territorial reasons. Indeed, the Huns destroyed Visigoths tribes and invaded its lands. They were fierce warriors and a much better rival that the Roman Army.
