Answer:
D
Explanation:
Ok well first off the bat, you know that obviously AC is equal to itself since the triangles share a side. That's Reflexive Property just saying. This is your first equal side.
AB is congruent to DC will form the term SSA in order.
AB is congruent to CD will form the term SSA in order.
AD is congruent to DC will form the term SSS or SSA in order.
AD is congruent to BC will form the term ASA in Order.
So AD is congruent to BC is the Answer!
Hope This Helped!