In the given diagram, you need to identify a pair of parallel lines.

From the diagram:

• Line $MK$ is parallel to line $LS$ because they both have the same direction and are indicated with parallel arrows.
• Lines $NP$ and $PQ$ are not parallel, as $NP$ is vertical, while $PQ$ is diagonal.
• Similarly, $PN$ and $MK$ are not parallel.
• $PR$ and $PQ$ are also not parallel, as they have different orientations.

The correct pair of parallel lines is:

$\boxed{MK \text{ and } LS}$

Would you like further details or have any questions?

Here are 5 related questions to consider:

1. What are the properties of parallel lines?
2. How can you use transversals to identify angles formed by parallel lines?
3. What is the significance of the red arrows on the diagram?
4. Why are lines $NP$ and $PQ$ not parallel?
5. How do perpendicular lines differ from parallel lines in this diagram?

Tip: Remember that parallel lines never intersect and always maintain the same distance between them.