Intervals between various B pitches

[Menu Jacques]

Hello folks,

Working on intervals, I bump into this question.

How is the right column below to be filled?

Downward interval between B## and:

        B#:    augmented unison or minor second?
        B:     major second or ...?
        Bb:    minor third or ...?
        Bbb:   major third or ...?

Thanks for your help!

JM