Choice "C" is correct. To qualify as an exempt organization, an applicant must not be a private foundation organized and operated exclusively to influence legislation.
Choice "d" is incorrect. A "feeder" organization, carrying on a trade or business for profit but distributing 100% of the profits to exempt organizations, is itself not tax exempt.
Choice "a" is incorrect. The applicant must be of a type specifically identified as one of the classes upon which exemption is conferred by the Code (e.g., organized for religion, charitable, scientific, etc., purposes).
Choice "b" is incorrect. A social club supported solely by members' dues and service charges does qualify as an exempt organization.