(A) Russia
(B) Japan
(C) China
(D) United Kingdom
Correct Option is: C
On July 1, 2023, China Railway announced the successful completion of performance tests of new high-tech components critical to CR450 high-speed trains at speeds exceeding 400 kilometres per hour (km/h), said to be the fastest in the world, marking another milestone in China’s world-leading high-speed rail technology.