Final answer:
During the Planning stage, marketers utilize SWOT analysis and environmental scans to align new product development with business objectives, assess market conditions, and strategize for product launch.
Step-by-step explanation:
During the d) Planning stage of product development, marketers will conduct a SWOT analysis and environmental scan to determine if a new product will help propel business objectives. The Planning phase is crucial as it involves the strategic evaluation of the product's potential in the marketplace through comprehensive market analysis. It incorporates understanding the market structure, competition, production, and cost conditions that the new product will face.