Which of the following best describes the relationship between mortar's air content and its workability?

Mortar's air content plays a crucial role in determining its workability. A higher air content generally leads to increased workability because the air bubbles create a more workable mixture that is easier to spread and shape. The entrained air forms tiny pockets in the mixture, which improve the mortar's ability to flow and reduce its density, making it more manageable. This is particularly beneficial when dealing with thick applications of mortar.

In contrast, options suggesting increased workability with lower air content or stating that air content has no effect do not align with the principles of material science as they relate to mortar composition. Lower air content can lead to a denser mixture, making it stiffer and harder to work with, while the assertion that air content has no influence overlooks the significant impact of air on the overall handling characteristics of mortar. Therefore, the relationship between mortar's air content and its workability showcases that increased air content enhances the overall performance and usability of the mixture.