China's dominance in the hi-tech industry can be largely attributed to its control over the supply of rare earth elements. These materials are critical for the production of a wide range of high-tech products, including smartphones, electric vehicles, batteries, and various electronic components.
Rare earth elements are a group of 17 chemical elements that possess unique properties, making them essential for many modern technologies. China has significant reserves and is the leading producer of these elements, which allows it to maintain a strong position in the global hi-tech supply chain.
Thus, the correct response to the question is:
rare earth elements