The correct answer is: B. Bevelled closer
A bevelled closer is a piece of a brick cut with its one corner equivalent to half the length and half the width of a full brick. It is used to fill the space between two full bricks at a corner.
A queen closer is a piece of a brick cut with its one corner equivalent to half the length and half the width of a full brick, but with a bevel on the outside edge. It is used to fill the space between two full bricks at a corner where the bricks are not aligned.
A king closer is a piece of a brick cut with its one corner equivalent to the full length and width of a full brick. It is used to fill the space between two full bricks at a corner where the bricks are aligned.
A half king closer is a piece of a brick cut with its one corner equivalent to half the length and width of a full brick. It is used to fill the space between two full bricks at a corner where the bricks are not aligned, but where the space is too small for a queen closer.