单选题 Public relations practice is the deliberate , planned and sustained effort to establish and maintain mutual understanding between an organization and its public.
【正确答案】 C
【答案解析】形容词辨析。deliberate深思熟虑的，故意的；A．complete全部的，完成的；B．related叙述的，相关的；C．intentional有意图的，故意的；D．active积极的，主动的；因此选项C为答案。