Final answer:
The demonstration executional style is being used when a laundry detergent advertisement shows the product will clean clothes whiter and brighter.
Step-by-step explanation:
The executional style being used when a laundry detergent advertisement shows the product will clean clothes whiter and brighter is demonstration. In this style, the advertisement demonstrates the effectiveness of the product by actually showing how it works.
In this case, the advertisement is demonstrating the ability of the laundry detergent to clean clothes whiter and brighter, possibly by using visual comparisons between clothes before and after they are washed with the detergent. This helps to convince the audience of the product's effectiveness and value.
Other examples of demonstration executional style include commercials showing the removal of tough stains, the removal of odors, or the ease of use of a cleaning product.