The great European plain is known for

Most of the Great European Plain lies below 152 meters (500 feet) in elevation. It is home to many navigable rivers, including the Rhine, Weser, Elbe, Oder, and Vistula. The climate supports a wide variety of seasonal crops. These physical features allowed for early communication, travel, and agricultural development.

Explanation:

b.

developed countries have tended to improve the environment, while developing countries have tended to damage it.