Answer:
the definition of migration is option B
A water molecule (H2O) will have a slightly positive side, and a slightly negative side. The oxygen side of water is the one that is negative, while hydrogen side tends to be more positive. When a molecule has a half negative and half positive side like water does, it is called a polar molecule. :D
The correct answer would be D my friend had this same question on FLVS and this was correct :)