The correct answer is: A. Bat
A bat is a brick that is cut in half lengthwise. It is used to stagger vertical joints in successive courses of a wall. This helps to distribute the weight of the wall more evenly and prevents cracking.
A header is a brick that is laid across the face of a wall, perpendicular to the stretchers. It is used to support the weight of the wall above it.
A stretcher is a brick that is laid lengthwise in a wall, parallel to the face of the wall. It is the most common type of brick used in masonry construction.
A closer is a brick that is used at the end of a course of bricks. It is cut to fit the space between the last stretcher and the end of the wall.
Here is a diagram that shows the different types of bricks:
The bat is the brick that is cut in half lengthwise. It is used to stagger vertical joints in successive courses of a wall.