The correct answer is A.

In option A, the two horizontal lines appear to run alongside each other at a constant distance without ever meeting, which is the definition of parallel lines.

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Here are some related questions for further exploration:

1. What is the definition of parallel lines?
2. How can you identify parallel lines in different types of figures?
3. What is the difference between parallel and perpendicular lines?
4. How do parallel lines behave in different types of geometric transformations?
5. Can lines appear to be parallel in certain perspectives but not actually be parallel?

Tip: When identifying parallel lines, look for lines that have the same direction and never intersect, even if extended infinitely.