Respuesta :
∆ABC already has side BC in common with ∆DBC, so you need information regarding the angles at B or C and the other side of those angles.
Of your choices, providing this information will prove the triangles congruent:
- ∠ABC ≅ ∠DBC . . . . . . . the "A" in SAS
- AB ≅ DB . . . . . . . . . . . . . the other "S" in SAS