Proof I need Help With question Now Please

Question

Which step in the proof has a flaw? 

Given AB¯≅BC¯, prove B is the midpoint of AC¯ 

Group of answer choices

Step 1

Step 2

No Flaw.

Step 3

Answer 1

Step 2 has a flaw. It assumes that AB and BC are parallel and AC is a straight line. AB and BC can be congruent (same length) and share point B without both points A and C being on the same line as B.