Answer:
Mountain Ranges
Large Bodies of Water
Deserts
Explanation:
It is important to note that the given choices are mostly on a geographical standpoint, rather than a political boundary.
1) Mountain Ranges: Southwest China (ranging from 重庆市 (Chongqing Municipality) to 西藏自治区 (Tibet Autonomous Region) districts), are primarily bordered by 橫斷山脈 (Hengduang Mountain Range). In the North, China is bordering the 太行山 (Taihang Mountain Range).
2) China primarily borders 黃海 (Yellow Sea), the 南海 (South China Sea) and 东海 (East China Sea), all of which are part of the Pacific Ocean.
3) Deserts have been growing (also known as desertification) naturally, and shrinking through Chinese government intervention, so parts of deserts may be subject to change regarding whether or not they are part of China. The most well known desert is the 戈壁 (Gobi Desert), which is found in North China.
Now, these 3 geographic features influence mainly the defensive aspects of borders. This is typically known as natural barrier. Mountain Ranges are known for being a natural barrier, as, when moving large amounts of troops and supplies across, it can take a long time. One well known example (though it is not part of China's history), is Hannibal and his crossing of the Alps into Rome. In reference to mountain ranges being natural defenses, it took around 16 days and he lost around half his army crossing. As many mountains typically do not have any kind of greenery or food based on climate, especially during the winter months. It is important to note, however, that while these are viewed as "natural barriers", they usually did not stop the Steppe tribes found in Mongolia during the Song Dynasty, leading to the topple of the Song and the Yuan Dynasty under Mongol rule. Other than civil wars (which occurred frequently during Imperial China, particularly after the death of a ruling emperor), there was few naval conflicts that occurred that Imperial China did not, herself, initiate.
Learn more about geographic features of China, here: https://brainly.com/question/4978867
