Find the odd measurement unit: Pick the option that is not a unit of length.

Introduction / Context:
Measurement-classification items typically contrast unit dimensions (length, mass, volume, etc.). Recognizing dimensional categories is sufficient to isolate the outlier.

Given Data / Assumptions:

• Mile: imperial/US customary unit of length.
• Centimetre: metric unit of length (0.01 metre).
• Yard: imperial/US customary unit of length.
• Litre: metric unit of volume.

Concept / Approach:
Group units by physical dimension. Three are length; one is volume.

Step-by-Step Solution:

Verification / Alternative check:
Dimensionally check conversions: length units convert into metres/feet; litre converts into cubic centimetres/cubic metres (volume), not into linear units.

Why Other Options Are Wrong:
They share the same dimension—linear measure.

Common Pitfalls:
Equating “small” units with different dimensions; units can be small (cm) and still be length.

Final Answer:
Litre