Question

what does the following notation describe?
\overline{ab} \parallel \overline{dc}
options:
two parallel segments
two congruent segments
two parallel lines

Explanation:

In geometry, the notation $\overline{AB}$ and $\overline{DC}$ represent line segments (since they have endpoints A, B and D, C respectively), and the symbol $\parallel$ means "parallel". So $\overline{AB} \parallel \overline{DC}$ means segment AB is parallel to segment DC, i.e., two parallel segments. "Two congruent segments" would use $\cong$, and "two parallel lines" would use notation for lines (like $\overleftrightarrow{AB}$) not segments.

Answer:

A. two parallel segments