Which of the Following Statements Is True of Sale of Collateral

Which of the following statements is true of sale of collateral?

A) In disposing of the collateral,the creditor must use a commercially reasonable method to produce the greatest benefit for himself.
B) The creditor must sell the collateral unless the consumer orally objects to the sale,otherwise,the creditor may keep the collateral in satisfaction of the debt.
C) If less than 80% of the purchase price has been paid,the creditor may propose to the debtor that the creditor keep the collateral in satisfaction of the debt.
D) If the creditor has a security interest in consumer goods and the debtor has paid 60% or more of the purchase price,the creditor must sell the repossessed collateral.