Which congruence theorem can be used to prove triangle abc congruent triangle dbc

The answer is the last option, which is: sas  the explanation is show below:   by definition, the sas theorem  (side-angle-side) stablishes that when you know two sides and one angle of a triangle and these are equal two the corresponding sides and angle of the other triangle, both triangles are congruent.  in this case, you know that both triangles have a right angle, and two equal sides.