Which is the weakest base of the following whose `pK_(b)` val-use are?

Which is the weakest base of the following whose `pK_(b)` val-use are?
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Which is the weakest base of the following whose `pK_(b)` val-use are? A. `4.75` B. `3.23` C. `3.12` D. `3.07`
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