Answer:
A
B D C graph of the triangle
statment/reasons
segment AD is an angle bicestor of angleBAC, AD is the hight of the triangle/Given
angleBAD=angleCAD/Def. of angle bicestor
AD=AD/Reflexive Property
angleADB=angleADC/Def. of Right Angle
triangleABD=triangleCAD/ASA
angleABD=angleACD/CPCTC
triangleABC is an isosceles triangle/Def. of isosceles triangles