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Length

The footstep ...

Question

The footstep is an unreliable measure of length because
(a) people do not measure properly with it.
(b) it varies from person to person.
(c) some people jump too much while measuring with the footstep.
(d) it is a standard unit of measurement.

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Solution

(b) it varies from person to person.

The footstep as a measure of length is unreliable measure of length because different people have different foot sizes.

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