Final answer:
The correct answer is option C. Header.
Step-by-step explanation:
The brick positioned to bond two wythes of masonry is known as a header. The header is a brick that is laid in a way that its end is visible on the face of the wall and is used to tie two separate wythes of masonry together for structural stability.
In contrast to the other options, a closer is a brick that is cut to fit within a course or to complete the bond near the end of a wall, a stretcher is a brick laid with its long face parallel to the wall, and a soldier is a brick laid vertically with its long, narrow side exposed.