Based on the maps, what region did more railroads tracks develop - the North or South? Why do you think so?

The correct answer to this open question is the following.

Although you forgot to attach the options for this question, we can say the following.

The physical features of China contributed to the challenges of the Shang and Zhou dynasties in that a large geographic area made it hard to protect the people.

This is correct because if we see a map of China, we can understand the extension of this land. China is so big, with many physical and geographical features that it was not an easy territory to defend.

However, the physical features also were advantages because they represented natural barriers or obstacles to China's enemies.

We are talking about the Yellow River, the Gobi Sea, the Yangtze River, the Pacific Ocean, the Taklamakan Desert, and the Himalayan mountains.