B2 is right on the planckian locus, between 6000 and 8000K and has a high color rendering index (+85)...
C0 could be nice also....color temperature is a bit lower (between 4500 and 6000K), but their CRI is also very high. I have an arc AAA with a C0 bin LED: beautiful white light (5500k) and very good color rendering...much better then any other LED i've ever seen. A little bit on the green side compared with normal A or B ranks.
The others are either too greenish (B0) or too blueish (A0)