What is true about metric tools regarding size?

Metric tools are designed to work with measurements that adhere to the metric system, which uses units such as millimeters and centimeters. When it comes to the size of metric tools, it's important to understand that they can indeed be used effectively if they are close to the size needed for a specific application.

For instance, when working on a pipe fitting job, if a metric tool is slightly larger or smaller than the required size, it may still function adequately for the task. This flexibility can be particularly useful in situations where the exact size is not within reach. In contrast, tools that are significantly off from the required size may not work, leading to inefficiencies or unsafe practices.

Other options suggesting that metric tools can never be used or suggesting they’re only usable in specific countries reflect a misunderstanding of their versatility and global adoption. Additionally, stating that they are always better ignores the fact that the suitability of the tool often depends on the specific requirements of the job at hand. Therefore, B highlights the practical reality of using metric tools effectively in various situations based on proximity in size.