Which of the Following Is Not Correct

Which of the following is not correct?

A) 1 µm = 10^{- 3} mm
B) 1 nm = 10^{- 6} µm
C) 1 µm = 10^{- 6} m
D) 1 µm = 10³ nm
E) 1 nm = 10^{- 9} m