Which statement is a CENTRAL idea of the article? A The metaverse will continue to improve in the future, and people will be able to access it with sunglasses one day. B The metaverse was first described in a science-fiction book from the 1990s, but it has existed since the 1980s. C The metaverse is an online virtual space where people come together, and it has both benefits and problems. D The metaverse can be accessed using virtual reality, but it can also be entered through regular screens.