A masonry unit made of clay and fired in a kiln is known as what?

The correct answer to the question is that a masonry unit made of clay and fired in a kiln is known as a clay facing tile. Clay facing tiles are specifically manufactured through a process that involves shaping clay into tiles and then firing them in a kiln at high temperatures. This process gives the tiles their durability and strength, making them suitable for various construction and design applications, especially in façade treatments.

In contrast to other options, concrete blocks are made from a mixture of cement, water, and aggregates, not clay. Brick veneer refers to a type of wall construction that utilizes a façade of bricks but does not define a unit made of clay itself. Glass blocks, made from glass, are used primarily for decorative or functional purposes like light transmission but are not made of clay. This underlines the unique characteristics and applications of clay facing tiles in masonry, distinguishing them clearly from other materials.