Which pair of triangles can be proven congruent by SAS?

Choice C. Triangles on the far right side

Note how the triangles here have the angles between the marked sides. The tickmarks indicate which pair of sides are the same length. The SAS sequence has "A" in the middle of the two "S" letters to mean that the angles are between the sides.

Extra info:

For choice A, we have SSA going on but that isn't a valid congruence theorem. There isn't enough info to say whether the triangles are congruent or not.With choice B, we have three pairs of angles that are the same measure. We don't have any info about the sides though. So we can't say if the triangles are congruent or not. The AA (angle angle) theorem only applies to similar triangles rather than congruent triangles.