By "Multiple Realizability"the Functionalist Means

By "multiple realizability"the functionalist means

A) mental events could be realized in many different forms and structures.
B) there are multiple theories of mind and all of them are equally plausible.
C) there are multiple mental events, but they are reducible to a small number of categories of brain events.
D) every person is unique, so there cannot be a science of the mind.