“Celsius” names a scale/unit used to quantify temperature. By the same “unit/scale : physical quantity” relation, “metre” is used to quantify which physical quantity?

Introduction / Context:
Analogy type: measurement mapping. “Celsius” is a temperature scale; temperature is the physical quantity. We must mirror this by pairing “metre” (a base SI unit) with its physical quantity: length (distance).

Given Data / Assumptions:
Recovery-First applied: original options lacked “length,” so we minimally repaired the option set to include the correct physical quantity while keeping the item’s intent unchanged.

Concept / Approach:
Keep the relation “unit/scale → measurand.” Metre measures length; “depth” is a particular dimension of length but is not the general physical quantity; “kilometer” is another unit; “tall” is an adjective; “speed” is different quantity (m/s).

Step-by-Step Solution:

Verification / Alternative check:
SI base units list metre as the unit of length.

Why Other Options Are Wrong:
They are either subtypes, other units, adjectives, or unrelated quantities.

Common Pitfalls:
Confusing a specific dimension (depth) with the general quantity (length).

Final Answer:
Length