Final answer:
Option (d), The key idea emphasized in the chart but not mentioned in the text is the comparison of the key finder to similar products on the market.
Step-by-step explanation:
The key idea emphasized in the chart but not the text is how the key finder compares to similar products. While the text from Electronics Today introduces the new Key Finder by SmartThink and highlights its features, such as the super-bright LED flashlight, the built-in antenna, and its effective locating capabilities, it does not provide a comparison to other products on the market.
Understanding how a product stacks up against its competitors can be an important deciding factor for consumers who are considering multiple options.