Answer:
(D)Reflexive Property of Congruence; SSS.
Step-by-step explanation:
Firstly, note that the other two sides of the two triangles have been stated to be congruent.
The reflexive property of congruence states that an angle, line segment, or shape is always congruent to itself.
Therefore:
Step 3: AC is congruent to CA by the Reflexive Property of Congruence.
If the three sides of a triangle are congruent, then the three angles will also be congruent.
Step 4: Angle ABC is congruent to angle CDA by the SSS Postulate.