Discussion
A conversion factor is best treated as
Answer: A
Correct answer: a ratio equal to one, multiplying any expression
Since 1 metre and 100 centimetres are the same length, the ratio of one to the other is exactly one, and multiplying by it changes the value of nothing while changing the units of everything. Treating conversions this way makes them algebra rather than recollection: write the ratio the way round that cancels the unit you have, and the arithmetic follows.
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