The correct answer is D
First Rule: Two bricks are added each time, starting from the centre and working outwards. Each row is completed before the next is started, and addition of two half bricks counts as adding one whole brick.
Second Rule: Bricks on the bottom left to top right diagonal have upward sloping cross-hatching.
Third Rule: The circle alternates between being on whole bricks that are central, and whole bricks that are on the far right.
Fourth Rule: Reading left to right, downward sloping cross-hatching is applied to the first, then second, then third full brick on every row, with incomplete rows being treated as though they were complete when determining this pattern. This sequence then repeats.