SI Unit of Length

The question asks to identify the SI unit of length from the provided options.

Understanding SI Units

The SI (Système International d'Unités) is the globally adopted standard system of measurement. It provides standardized units for various physical quantities.

Identifying the Correct Unit

For the physical quantity of length, the standard base unit defined by the SI system is the metre.

Analyzing the Options

• Metre: This is the correct SI base unit for length.
• Inch, Feet, Mile: These units are part of the imperial and US customary systems, not the internationally recognized SI system.

Therefore, the SI unit of length is the metre.