Which one of the following words/phrases is most appropriately used to denote "an interoperable network of 3D virtual worlds that can be accessed simultaneously by millions of users, who can exert property rights over virtual items"?

The metaverse is generally understood as a network of 3D virtual worlds where users, represented by avatars, can interact in real-time.

These environments emphasize social and economic connections, allowing users to exert property rights over virtual items.

While often associated with Virtual Reality (VR) and Augmented Reality (AR) technologies, the core concept revolves around a shared, persistent digital world.

Hence, option (c) is the correct answer.