The image shows Chinese pottery. A vase and a pot with a lid. Both pottery items are white with leafs painting in blue.

How does this image explain cultural diffusion?

It shows the Islamic influence on Chinese pottery making.
It shows how the Chinese learned new food-storage methods.
It shows the difference between Buddhist and Islamic cultures.
It shows how cobalt was spread from Chinese to Muslim culture.

I think it is.

It shows how cobalt was spread from Chinese to Muslim culture.

Because colour of cobalt is blue. And I don't think that chinese and islamic culture had influence if each other on them.

the american rail road was the most influential and useful transportation system developed in the 1800's with steam locomotives and in the very late 1800's and early 1900's diesel electric locomotives being used to transport goods and people around the newly expanded united states!