In the advertisement "Stanley Steamer: Tough on Dirt. Gentle on Carpet," what quality is emphasized?

The advertisement "Stanley Steamer: Tough on Dirt. Gentle on Carpet" emphasizes versatility as a key quality. This is demonstrated through the contrasting phrases "tough on dirt" and "gentle on carpet." By using these descriptors, the advertisement conveys that the product can effectively handle a rigorous cleaning task while also being delicate enough to preserve the integrity of the carpet. This suggests that the product is suitable for a range of cleaning tasks, making it versatile in its application. It addresses the consumer's need for a cleaning solution that can perform well across different scenarios without damaging sensitive surfaces.

The other qualities, while relevant to cleaning products, do not capture the primary message of the advertisement as effectively. Durability is implied, but the main focus is on the balance between strength and gentleness, which denotes versatility. Cost-effectiveness and comfort also do not specifically resonate with the primary themes presented in the advertisement. Therefore, versatility is the most fitting quality being emphasized.