The answer is: B. Fraction : Percentage
An arc is a part of a circle, while a segment is a part of a line. A fraction is a part of a whole, while a percentage is a part of a hundred. A pie is a whole, while a slice is a part of a pie. A number is a single value, while a court is a group of people.
In the original pair of words, “arc” and “circle”, “arc” is a part of “circle”. In the answer pair, “fraction” and “percentage”, “fraction” is a part of “percentage”. This is the same relationship as the original pair of words.
In the other options, “segment” is not a part of “line”, “pie” is not a whole, and “number” is not a single value.