Which one of the following is an example of a block mountain ........

Explanation:

Black Forest is an example of a block mountain. The  Black  Forest  is  a  wooded mountain range in Baden-Wurttemberg, southwestern Germany. It is bordered by the Rhine valley to the west and south. The highest peak is the Feldberg with an elevation of 1,493 metres (4,898 ft). The region is almost rectangular with a length of 160 km (99 mi) and breadth of up to 60 km (37    mi).