Question

1. $overline{ab} cong overline{bc}$
2. $overline{bc} cong overline{ef}$
3. $overline{ab} cong overline{ef}$
4. $ab = ef$
5. $eg = ef + fg$
6. $eg = ab + fg$

statements

1. given
2. given
3. transitive prop.
4. def. of $cong$ segs.
5. seg. addition
6. substitution

reasons
$\bigcirc$ it is part of the given information.
$\bigcirc$ it is part of the argument.
$\bigcirc$ it is the conclusion.
$\bigcirc$ it is an assumption.

Explanation:

The statement $\overline{AB} \cong \overline{EF}$ is derived using the transitive property from the given congruent segments, so it is a step within the logical chain of the proof (the argument) rather than given information, a conclusion, or an assumption.

Answer:

It is part of the argument.