How many meters are in one kilometer?

The correct answer is based on the metric system's definition of length, where one kilometer is equivalent to 1,000 meters. This relationship is a fundamental aspect of metric measurements, simplifying conversions within the system. Since "kilo-" denotes a factor of 1,000, it directly indicates that one kilometer consists of precisely 1,000 individual meters. Understanding this conversion is essential not only for academic purposes but also for practical applications, such as calculating distances in various fields, including science and nursing. The other choices do not align with the metric standard, as they represent different measurements that do not equal a kilometer.