Question

In ∆ABC shown below, Line segment AB is congruent to Line segment BC.
Given: line segment AB≅line segment BC
Prove: The base angles of an isosceles triangle are congruent.
The two-column proof with missing statement proves the base angles of an isosceles triangle are congruent.
ANSWER OPTIONS:
1. Line segment BD≅ Line segment AC

2. Line segment BD≅ Line segment BD

3. Line segment AC≅ Line segment AC

4. Line segment AD≅ Line segment DC