Which of the Following Measurements Is Likely to Have the Least

Which of the following measurements is likely to have the least variation?

A) The individual heights of children, measured in inches, in a randomly selected class of sixth grade students.
B) The individual mass measured in grams of quarters in a randomly selected ten dollar roll of quarters.
C) The individual weights in ounces of oranges in a randomly selected five- pound bag of oranges at the market.