Answer:
The first graph is neither. It cannot be proven to be the same shape by translation, rotation, reflection, or dilation.
The second graph is congruent. Congruent transformations include: translation; rotation; and reflection. The graph is reflected, and rotated, so it is congruent.
The third graph is similar. It is dilated, so it cannot be congruent, but, the shape is equivalent with the dilation, making it similar.
I hope this helps :)