What is the european river that flows from the swiss alps to the north sea?

River Rhine

Explanation:

The River Rhine is one of the largest rivers in Europe. It starts its flow from the Alps in Switzerland, forms part of the border between Switzerland and Austria, then forms the entire border between Switzerland and Germany, the southern part of the border between France and Germany, runs through the western part of Germany, makes a turn and goes through Netherlands, and ends up in the North Sea. This river is the most important river in the region, and it has especially been important from economic aspect for Germany and the Netherlands. In fact, the most industrialized part of Germany, thus in Europe as well is along the banks of the River Rhine.

the answer is the last option or letter d)