Large quantities of information, as well as some timely help since the organization was bu

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A. has offered
B. had been offered
(答案→)C. have been offered
D. is offered
解析：句意：从这个组织被建立以来，大量的信息和一些及时的帮助就被提供。表示自过去某一时刻到说话时这段时间中的经历，用现在完成时，且“大量的信息和一些及时的帮助”与“提供”之间是被动关系，故用现在完成时的被动语态，选C。