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which phrase describes an unknown or changeable quantity?

A4 quarts in a gallon
BA score of 27 points
C80 miles per hour
DThe number of different colors on the page

Verified Answer :

"The number of different colors on the page" is the one phrase among the following choices given in the question that describes an unknown or changeable quantity. The correct option among all the options that are given in the question is the fourth option or option "D". I hope the answer helped you.