The most relevant response that illustrates how innovation and trade have led to cultural diffusion in the twenty-first century is:
The internet speeds up the rate at which music and other media spread from one place to another.
This response highlights the role of technological innovation (in this case, the internet) in facilitating the rapid exchange and dissemination of cultural products, such as music and media, across global boundaries. This diffusion occurs at an unprecedented rate, allowing diverse cultures to influence one another more easily than ever before.