Which Statement Correctly Distinguishes Kinetochore Microtubules from Polar Microtubules

Multiple Choice

Which statement correctly distinguishes kinetochore microtubules from polar microtubules?

A) Kinetochore microtubules are replaced by polar microtubules when the chromatids move toward the poles.
B) Only polar microtubules contain cytoplasmic dynein,which acts as a "molecular motor."
C) Kinetochore microtubules attach to the chromosomes,whereas polar microtubules extend from one pole to the other.
D) Kinetochore microtubules form before polar microtubules.
E) There is no difference;they are both names for the same structure.