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C is corrent because when consignment sales are shipped as regular sales, accounts receivable would be debited for large amounts. However, because the consignee is under no obligation to pay for the goods until they are sold, accounts receivable would be credited in small periodic amounts.
A is incorrect because consignments may or may not be in small quantities.
B is incorrect because the existence of numerous shipments may or may not represent consignments; also, with consignments, one would expect returns. 
D is incorrect because one would ordinarily expect small periodic credits as items are individually sold.