"Multiple use" refers to the utilization of natural resources in combinations that will best meet the present and future needs of the public. Designating land as a wilderness area does not necessarily violate the multiple-use philosophy, for even when such use does not provide the greatest dollar return, it can provide the greatest overall benefit from that site. Which one of the following is an assumption required by the argument? ['The multiple-use philosophy takes into account some nonfinancial needs of the public.', 'Natural resources should be used in combinations that will most greatly benefit present and future generations.', 'The present and future needs of the public would best be met by designating greater numbers of wilderness areas.', 'Designating a wilderness area prevents any exploitation of natural resources in that area.']