Because they knew that Germans could sink any ship they want. They could sink civilian ships. Back then, the only way to travel long distances was by boat, because passenger airplanes had not been invented. The Germans could now sink them if they wanted to travel somewhere, so they either risk their life or not go on trips.
Correct answer choice is :
<h2>A) Venetian Sea Trade Routes</h2><h2 /><h3>Explanation:</h3><h3 />
The trade lines in Italy and Europe that confirmed the fate of many a city and community in the 12th Century onward very much depended on the trade routes around the Mediterranean. These were the corner of the Italian Maritime Republics, particularly Genoa and Venice.
