Which region did the Franks invade after crossing the Rhine River? A. Greece B. Germany C. Italy D. Gaul

The region that the Franks invaded after crossing the Rhine River is D. Gaul. This is because neither of the other countries existed, per se. During the ancient, Gaul was the territory that included today's France, Luxembourg, Belgium, Switzerland, Northern Italy, but also parts of the Netherlands and Germany, so obviously that is the correct answer. The Franks were, after all, one of the first Germanic tribes that settled in these areas.