Your agency received 10 proposals in response to a solicitation issued.Award will be made to the one offeror whose proposal represents the best value to the government.After evaluation all of the proposals, the government contracting officer determined that the number of acceptable proposals exceeded the number at which an efficient completion could be conducted.The solicitation included FAR 52.215-1, instructions to Offers - Completive acquisition class.What action should the contracting officer now take?