【已刪除】I regret to i nfor m you that an err or w as m ade in o ur i nvoice n umber A235 of Septemb er 10. The correct charge for cotton underwear, medium, is $15.50, and not 15.00 as stated. We ar e ther efor e enclosing a ______ f or the amount undercharged, namely $50. (A)dispatch note (B)debit note (C)cr edi t not e (D)co ll ecti on l et ter