Researchers Measured the Length of the Central Retrix (R1), a Flight-Involved

Multiple Choice

Researchers measured the length of the central retrix (R1) , a flight-involved tail feather, in 21 female long-tailed finches. A boxplot of the length, in millimeters (mm) , is given here:
Based on this boxplot, to which value is the interquartile range closest?

A) 10 mm
B) 25 mm
C) 60 mm
D) 70 mm