During the reign of the Chin dynasty, the construction of the Great Wall of China took place. The Great Wall is a vast series of fortifications that were built to protect China from various invasions and attacks. Although the other options listed in the question (Sung, Tang, and Han) were important dynasties in Chinese history, they were not responsible for the construction of the Great Wall. The Chin dynasty, also known as the Qin dynasty, was established by Emperor Qin Shi Huang and lasted from 221 to 206 BC. It was during this dynasty that the ambitious project of building the Great Wall was initiated, showcasing the dynasty`s military strength and determination to protect China`s borders.