The pharaohs of this time period built the largest and most famous tombs called pyramids. a. first dynasty b. second dynasty c. third dynasty d. fourth dynasty

Option D. Fourth Dynasty is the most appropriate and correct answer.

Although the kings of III dynasty of old kingdom started building pyramid like structures but it were the Pharaohs of IV dynasty who build the largest and beautiful and true pyramids. Their period is being called the golden age or "the age of pyramid". It was during the IV dynasty the Pharaoh Khufu built the Great Pyramid of Giza which is one of the seven wonders of the World.