The socket that has the smallest measurement is 5/16.
In order to know the socket with the smallest measurement, we can change the fractions to percentages and this will be:
5/16 = 5/16 × 100 = 31.25%
3/8 = 3/8 × 100 = 37.5%
13/32 = 13/32 × 100 = 40.625%
15/32 = 15/32 × 100 = 46.875%
From the percentages, then the smallest measurement is 5/16
In conclusion, the correct option is C.
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