It Was During the Neolithic Period That __________ Monuments Were

It was during the Neolithic period that __________ monuments were erected,and the most famous example is __________.

A)  ​architectural; the Great Pyramids 
B)  ​Mesolithic; the Ziggurat at Ur 
C)  ​monolithic; Stonehenge 
D)  ​megalithic; Stonehenge 
E)  ​Sumerian; the Ziggurat at Ur