Which of the following best describes the characteristics of mortar?

The best choice describes mortar as a mixture primarily used for bonding masonry units. Mortar is a workable paste that typically consists of a mixture of sand, water, and cement or lime. Its main function is to act as a binding agent, effectively holding together bricks, stones, and other masonry units. This bonding capability allows for the construction of stable and durable structures.

While water is indeed a key ingredient in mortar, stating that it contains no water is inaccurate, as the water helps in the curing process and achieving the desired consistency. The statement about providing structural support can be misleading, as mortar does not provide structural support in the same way that masonry units do; rather, it functions to hold the units together. Furthermore, the curing process of mortar generally takes time to achieve full strength, which does not align with the idea that it cures quickly, as proper curing is essential to developing its strength over time.