The correct option is A Chu Ruler
The Great Wall of China was not built all at one time. In 7th and 8th century BC, battles happened frequently among the states of the Spring-Autumn and Warring States dynasty and in order to defend themselves they began to built walls and towers on the borders. It was the state Chu who first built the wall. It was during the Qin Dynasty that the kingdom of Qin united the different parts into one empire. To defend off the invasions from northern invaders, Emperor Qin Shi Huang had all the walls joined up. Thus, the Great Wall came into being.