Adrawing by may have been used as the basis for the apple cup (below), but the metalwork was a collaboration of the family. a. altdorfer; nuremberg b. durer; krug c. krug; durer d. durer, munich

The correct answer is B) Durer; Krug.

A drawing by Durer may have been used as the basis for the Apple Cup, but the metalwork was a collaboration of the Krug family.  

Albert Drurer (1471-1528), was a German painter. That belonged to the Renaissance period. He was supported by Emperor Maximilian I, and had relationship with other artists of the time such as Leonardo Da Vinci, Raphael, and Bellini. The drawing in the photo(attached) by Durer may have been used as the basis for the Apple Cup, but the metalwork was a collaboration of the Krug family.  

the great wall of china worked as a defense for the feudal states of the zhou dynasty to the north. during the warring states period more walls were put up to defend the borders of the different kingdoms. it was semi successful because despite the wall, the mongols eventually conquered china also the great wall provided protection to the economic development and cultural progress, safeguarded the trading routes such as the silk road, and secured transmission of information and transportation. @jayxboof