The correct answer is A. English bond.
English bond is a type of brickwork bond in which every course contains both headers and stretchers. Headers are bricks that are laid lengthwise, while stretchers are bricks that are laid widthwise. English bond is the most common type of brickwork bond, and it is used in a variety of applications, including walls, chimneys, and fireplaces.
Flemish bond is a type of brickwork bond in which every other course contains headers and stretchers. This creates a pattern of alternating headers and stretchers, which is visually appealing. Flemish bond is often used in decorative brickwork, such as on the facades of buildings.
Russian bond is a type of brickwork bond in which every course contains headers and stretchers, but the headers are staggered. This creates a pattern of alternating headers and stretchers, with the headers offset from each other. Russian bond is less common than English bond or Flemish bond, but it is sometimes used in decorative brickwork.
Mixed bond is a type of brickwork bond in which two or more types of bonds are used together. This can be done to create a variety of visual effects, or to use different types of bricks in the same wall. Mixed bond is often used in decorative brickwork, but it can also be used in structural applications.