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Stoutland for B at the least, despite Hippowdon not being good in this meta due to its low speed and being vulnerable to freeze  and flinch, in sand Stoutland outspeeds almost everything and can hit all pokemon for huge damage with crit returns, super powers and pursuits/bite (flinch move) with the last move being Iron Head (even more flinch shenanigans with immense speed in the sand). It might be better in this meta to run Life Orb instead of Choice Band (because one free turn due to a forced switch can be disastrous).

I would argue for A too, the only downside is having to run Hippowdon / Tyranitar (Both of who have low speed for this meta and scarfing Hippowdon is just silly )