In applying the values used for comparison purposes under subparagraph (B), there shall be taken into account differences with respect to the sales involved (if such differences are based on sufficient information whether supplied by the buyer or otherwise available to the customs officer concerned) in—
(i) commercial levels;
(ii) quantity levels;
(i)#
commercial levels;
(ii)#
quantity levels;
(iii)#
the costs, commissions, values, fees, and proceeds described in paragraph (1); and
(iv)#
the costs incurred by the seller in sales in which he and the buyer are not related that are not incurred by the seller in sales in which he and the buyer are related.