Choice "B" is correct. Absent an agreement otherwise, the seller is not obligated to deliver the conforming goods to the buyer, but merely needs to hold them for the buyer's disposition.
Choice "c" is incorrect. Absent an agreement otherwise, a seller has no duty to deliver the conforming goods to the buyer.
Choice "d" is incorrect. Absent an agreement otherwise, a seller has no duty to deliver the conforming goods to a common carrier.
Choice "a" is incorrect. Absent an agreement otherwise, a seller need not hold the conforming goods aside for inspection before delivery.