Answer:
C. 18/48 and 21/56
Explanation:
You want to identify pairs of ratios that are proportional.
Proportional
Ratios are proportional when they have the same value. We can check whether the values are the same by reducing each ratio to lowest terms.
The attached calculator display shows the proportional ratios are ...
18/48 and 21/56 . . . . choice C
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Additional comment
Both of these reduce to 3/8. You can remove a factor of 6 from the numbers of the first ratio, and a factor of 7 from the numbers of the second ratio to reduce both of them to 3/8.
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