To determine which part is most appropriately matched with its unit, let's analyze each option:
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18 of a week (a week is 7 days): This is not appropriate because 18 is more than the total days in a week.
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Start Fraction 1 over 8 End Fraction of a week (a week is 7 days): Calculating this gives (1/8) * 7 = 0.875 days, which is appropriate but not a common use case for a week.
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12 of a foot (a foot is 12 inches): This is appropriate, as it correctly matches the definition of a foot (there are 12 inches in a foot).
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Start Fraction 1 over 2 End Fraction of a foot (a foot is 12 inches): This is also correct, as (1/2) * 12 = 6 inches, which is indeed a valid measurement.
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3% of a pint (a pint is 16 ounces): This gives (3/100) * 16 = 0.48 ounces, which is appropriate but again not the most common context.
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0.2 of a year (a year is 365 days): This means 0.2 * 365 = 73 days, which is a valid measurement but not specifically tied to a unit frequently.
Based on this evaluation, the best match is:
12 of a foot (a foot is 12 inches), as it directly aligns with the definition of a foot.