Which of the Following Measurements Has the Highest Precision

Multiple Choice

Which of the following measurements has the highest precision?

A) the height of the classroom wall (around 300 cm) with uncertainty of 3 cm
B) the depth of a canyon (around 1800 m) with uncertainty of 15 m
C) the thickness of human hair (0.0001 m) with uncertainty of 0.00003 m
D) the mass of 1 kg with the uncertainty of 0.005 g