Final answer:
The market-product grid is a tool developed to aid in marketing planning to increase sales and profits, not to track profits or expenses by category directly.
Step-by-step explanation:
The correct answer to the question about what is true of a market-product grid is d. It is developed to trigger marketing actions to increase sales and profits. A market-product grid is a strategic marketing tool that helps firms understand different market segments and how various products or services fit within these segments.
Compared to other options, it focuses not on financial measures directly such as profits or expenses, but on analysis and planning that can lead to these financial outcomes through informed marketing actions.