The correct answer is D.

The CPCM course describes promotion as a key driver of incremental sales and a retailer differentiation tool. It further explains that the promotion course covers promotion from both a marketing perspective and a promotion/flyer program perspective, including planning, execution, assessment, and the factors that affect promotion outcomes.

That directly supports option D. Promotional strategy is used to influence shopper behavior, create awareness, generate incremental demand, support category objectives, and improve sales performance through targeted promotional activity. The promotion must be assessed through lift, incremental sales, subsidy, ROI, breakeven, cannibalization, and other measures because the objective is not merely to run activity; it is to produce measurable business impact.

Option A is wrong because supply chain and inventory are operational support areas, not the primary purpose of promotional strategy. Option B is wrong because pricing strategy is related but separate. Option C is too broad; promotional strategy supports business growth, but it is not the overall corporate business plan.