what is the answer??

Answer:
The answer is D.
Explanation:
In geometry, parallel lines are lines in a plane which do not meet; that is, two lines in a plane that do not intersect or touch each other at any point are said to be parallel. By extension, a line and a plane, or two planes, in three-dimensional Euclidean space that do not share a point are said to be parallel.
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Answer: The are equal width apart, travel in the same direction and never meet.
Explanation: Parallel lines never meet and they are at a certain distance from each other. Besides they travel in the same direction.