Which of the following statements is true about carbon's use in watchmaking?

Carbon plays a significant role in watchmaking, especially due to its exceptional properties. Its use is primarily concentrated in cases, as carbon materials, such as carbon fiber or carbon nanotubes, offer a high strength-to-weight ratio and are resistant to scratches and corrosion. This makes carbon an ideal material for creating cases that are not only durable but also lightweight, enhancing the overall performance and user experience of the watch.

In contrast, the other options do not accurately reflect the role of carbon in watchmaking. While carbon does have various applications, it is not widely known for eliminating the need for lubrication in mechanical movements, nor is it exclusively excluded from use in dials or primarily used in watch bands. Therefore, the statement regarding its primary use in cases is the most accurate representation of carbon's functionality within the context of watchmaking.