29) D
Starting from left to right on each row, let us label each of the tiles.
A B C D
E F G H
I J K L
1. A is unique
2. B is similar to F and H
3. C is similar to E and G
4. D is unique
5. I is similar to J
6. K is unique
7. L is unique
So there are 7 different patterns. So D is the answer.