Explanation
The correct answer is A: South Korea.
South Korea launched the world's first nationwide 5G mobile network on April 3, 2019. The launch was initially limited to a few major cities, but it quickly expanded to cover the entire country, making it the first country in the world to achieve nationwide 5G coverage.
The 5G network offers faster internet speeds and more reliable connections than previous generations of mobile networks. It also has the potential to enable new technologies such as self-driving cars, smart cities, and the Internet of Things (IoT).
South Korea is a leader in mobile technology and has some of the highest rates of mobile phone use in the world. The country is home to major technology companies such as Samsung and LG, which have been instrumental in the development and rollout of 5G technology.
