Answer:
A, Cell division
Step-by-step explanation:
During cell division, in the phase called "anaphase" the spindle fibers pull apart the chromosomes to separate sides.
Since we now know it is from the phase anaphase, it could not be B or D.
We are now left with A and C.
Centrioles function is to organize the spindle fibers, this has nothing to do with pulling apart chromosomes.
Cell division has phases(PMAT), one of which is anaphase where this function occurs.