Let $$A = \begin{bmatrix} 5 & 5\alpha & \alpha \\ 0 & \alpha & 5\alpha \\ 0 & 0 & 5 \end{bmatrix}$$. If $$|A^2| = 25$$, then $$|\alpha|$$ equals

A

$$5^2$$

B

1

C

$$1/5$$

D

5