Two options, and a third, which renders the first two redundant

I am in a predicament, so I would appreciate any help that you experts can provide.

I have two options, A and B, which say either is required and a third option, C which says either A or B is needed.

Now if i give these options to the user, I am afraid the user may select C, and A, or B. which is a strange selection because this way they are saying, I want B, and I want A, or B.

I don't know if i am making sense, so, I have here, and images with an example.

Thanks in advance :)