Which of the following matrix are singular?

• A. ( begin{bmatrix}31&12 26&8 end{bmatrix} )
• B. ( begin{bmatrix}1&11 2&8 end{bmatrix} )
• C. ( begin{bmatrix}13&12 22&8 end{bmatrix} )
• D. ( begin{bmatrix}3&12 2&8 end{bmatrix} )