Answer :

Final answer:

c) metres

The basic unit of length in the SI system is the meter (c). It is part of the metric system and has evolved in its definition, with the current one based on the distance light travels in a vacuum within a specific fraction of a second.

Explanation:

The basic unit of length in the SI system is metres (c). SI Units, also known as the International System of Units, is a metric system that uses a set of base units for fundamental measurements. The meter is the SI base unit used for measuring length. Derived units, such as volume, use the meter as a fundamental component; hence, a cubic meter (m³) is a unit of volume representing a cube with edges measuring exactly one meter.

Throughout history, the definition of meter has evolved for greater precision. Originally established based on the distance from the equator to the North Pole, it was later redefined by physical objects, and even further by the properties of light. Today, a meter is defined as the distance light travels in a vacuum in 1/299,792,458 of a second, tightly linking it to the speed of light. Other SI base units include the kilogram for mass and the second for time. Metric prefixes can be applied to the meter, enriching the system with scalability for various applications. To facilitate conversions in science, utilizing SI units for measurements like length, mass, and time is the standard practice.

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