Searching "electron configuration of chromium on google images will easily provide you with the answer.
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A is an acid. Not the answer.
B is correct. That would be a base. But it is not an Arrhenius base. Keep reading.
C that is exactly what an Arrhenius base is.
D. No an acid of some sort would accept OH ions.
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D is concentrated and it is also a weak base. Good cleaning fluid. Smells awful but it works.
Hard question !! Is this math .. if not then oh okay cause I’m bad at math but good at everything else so let me think about it !