Answer:
The answer is 4) A unit rate always relates quantities with the same units.
Step-by-step explanation:
It cannot be 1 because a unit rate relates a quantity to 1. Hence the word unit which means single or undivided whole.
It cannot be 2 because you can indeed use unit rates to compare two rates. In fact we do all the time in math! Just like comparing fractions.
It cannot be 3 because the rate has to be equivalent to its unit rate or else its wrong.
Thus making it four!
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