Answer:
It connects Central Europe with Eastern Europe, It is used for trade, It is used for transportation
are the correct answers.
Step-by-step explanation:
Danube river is the longest river in European Union and second longest in Europe. It 2,860 km long and flows through ten countries. It is one of the important waterways of Europe. There are three canals built on Danube. It originates in the black forests of Germany and empties into black sea via Danube delta in Ukraine and Romania. In drains 19 European countries.
Today due to its importance as a trade route it is known as " Corridor 7" of the European Union. It connect the industrial centres of Western Europe wit th Black Sea.