The presence of many rivers and mountains protected china from invaders, and allowed their culture to grow with little outside influence.

True.
The Chinese culture did grow large and great without the help from any outside influence especially from the English who were literally taking over the world. Japan was getting semi influence from the Netherlands which they traded with. So yes the Chinese was protected by the natural geographic structure of the land.

Hope this helps

A)30b)29c)28d)31hope this .