题目:What is promotion? The product is presented to customers through advertising (e.g. TV , radio spots, newspaper advertisements, , packing (e.g. design, , ), publicity , public relations (P. R. ) and personal selling.
A. ["posters","materials","labels","commercials"]
B. ["posters","materials","labels","commercials"]
C. ["posters","materials","labels","commercials"]
D. ["posters","materials","labels","commercials"]
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