Which reason best highlights germany’s use of unrestricted submarine warfare? question 15 options: germany did not have periscopes on their submarines and could not tell where they were firing their torpedoes germany was desperate for naval success, so they began attacking all ships regardless of neutrality or civilians aboard. german torpedoes would often lock on to the wrong target and impact civilian and merchant ships germany thought that unrestricted submarine warfare would discourage the us from joining the war effort.