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C is corrent because under the Bankruptcy Code, one of the elements which must be established in proving that a preferential transfer was made is that the transferee-creditor received more than he would have received in a liquidation proceeding.
A is incorrect because one of the elements which must be present to prove that a preferential transfer has been made is that the transfer involved an antecedent debt. Since the transfer described in this answer was a contemporaneous exchange for new value given, no antecedent debt was involved; thus, no preferential transfer can exist.
B is incorrect because the question asks what element is necessary to prove that a preferential transfer to a creditor who is not an insider exists. Although the element described in this answer is necessary when proving that an insider preference has occurred within 1 year of the filing of the bankruptcy petition, it is not a necessary element needed to prove that a general preference has occurred within 90 days of the filing of the bankruptcy petition.
D is incorrect because a trustee need not obtain the permission from the bankruptcy judge prior to avoiding a preferential transfer.