Final answer:
Two sides and an included angle can be proven congruent by SAS.
Step-by-step explanation:
The pair of triangles that can be proven congruent by SAS is option a) Two sides and an included angle. SAS stands for Side-Angle-Side, which means that if two triangles have two corresponding sides that are congruent and the included angle between those sides is congruent, then the triangles are congruent. For example, if triangle ABC has side AB congruent to side DE, side BC congruent to side EF, and angle B congruent to angle E, then triangle ABC is congruent to triangle DEF.