A unit rate is typically expressed as a ratio that compares a quantity to one unit of another quantity. It is often written in the form of a fraction where the numerator expresses the quantity of interest and the denominator expresses one unit of another quantity.
Among the options provided, the fraction that represents a unit rate is:
Start Fraction 1 over 27 End Fraction.
This fraction can be interpreted as having a quantity of 1 for the numerator, which is characteristic of a unit rate, compared to a different quantity of 27 in the denominator. The other fractions do not represent unit rates because their numerators do not equal 1 in relation to their denominators.
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