The Qin began to construct a wall that became known as the Great Wall of China in order to prevent the invasion of people from the north.
The Qin dynasty was founded by Qin Shi Huang. it was established in 221 BC and last till 206 BC it was the first dynasty of imperial china. it was expended in Shang yung region due to his legal reform. The Qin dynasty is known for its engineering marvels, including a complex system of over 4,000 miles of road and one superhighway, and great wall of china. Qin dynasty followed rule of law ,and this is also one of the reason of prosperity of Qin dynasty. it was one of the strongest dynasty of China.
The Great Wall of China is a series of fortification .it was made as protection against various nomadic groups from the Eurasian Steppe ,and people of north. it was started by Qin dynasty but Later on, many successive dynasties built and maintained multiple stretches of border walls. Qin Shi Huang, was the mastermind behind the great wall of china.
invasion refer to an attack on other empire or country with an arm force. invasion also named as conquest or plunder. the main reason behind invasion was economic and wealth and the expansion of empire.
hence, option D is correct
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