Final answer:
To identify parallel segments, check if they have the same slope. If they do, they are parallel.
Step-by-step explanation:
In order to identify parallel segments, we need to look for segments that have the same slope. If two segments have the same slope, they are parallel.
In option a, all three segments are parallel to each other and are along the x-axis, so they have the same slope of 0.
In option b, if three segments are mutually perpendicular to each other, they cannot be parallel. Perpendicular segments have slopes that are negative reciprocals of each other.