The correct answer is: A. Single Flemish bond
Single Flemish bond is a type of brick masonry bond in which every other course is laid with headers, and the courses in between are laid with stretchers. This type of bond is strong and durable, and it is often used in load-bearing walls.
Double Flemish bond is a type of brick masonry bond in which every course is laid with headers and stretchers. This type of bond is even stronger than single Flemish bond, and it is often used in very heavy load-bearing walls.
English bond is a type of brick masonry bond in which every other course is laid with headers, and the courses in between are laid with stretchers. However, the headers in English bond are laid so that they are centered over the stretchers in the course below. This type of bond is not as strong as single or double Flemish bond, but it is more attractive.
Zigzag bond is a type of brick masonry bond in which the bricks are laid in a zigzag pattern. This type of bond is not very strong, and it is not often used in load-bearing walls. However, it can be used to create decorative effects.