1. There are 9 cells in the matrix.
2. A cell contains a set of three squares b,w,s.
3. There are no duplicate cells in the matrix.
4. Each row in the matrix contains all 3 types of squares b,w,s.
5. Each row of the matrix contains only 2 cells with the same center square.

A is my answer.

1. There are 9 cells in the matrix.
2. A cell contains a set of three squares b,w,s.
3. There are no duplicate cells in the matrix.
4. Each row in the matrix contains all 3 types of squares b,w,s.
5. Each row of the matrix contains only 2 cells with the same center square.

A is my answer.