The question asks about the common characteristic shared by Metre, Mile, and Kilometre. Let's analyze the options to identify the correct answer.
They are units of electricity: This option is incorrect because Metre, Mile, and Kilometre are not used to measure electricity. Units of electricity include watt, kilowatt, and volt.
They are units of measuring anything: While Metre, Mile, and Kilometre are units of measurement, they specifically measure distance, not "anything". This option is overly broad and not precise enough to be correct for this context.
They are units of distance: This is the correct option. Metre, Mile, and Kilometre are standard units used to measure distance. The Metre and Kilometre are parts of the metric system, while the Mile is a unit used in the imperial system.
They are units of weight: This option is incorrect because these terms are not related to weight. Units of weight include kilograms, grams, and pounds.
Thus, the correct answer is: They are units of distance.