Why are field lines inside a solenoid described as parallel straight lines?

Question

Why are field lines inside a solenoid described as parallel straight lines? — Exam MCQ

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D. Because the magnetic field is the same at all points inside, indicating uniformity — The correct choice is Because the magnetic field is the same at all points inside, indicating uniformity. The result follows from the relevant magnetic-field, electromagnetic-induction or Fleming/right-hand-rule principle.

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A. Because the current changes direction rapidly

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B. Because the solenoid is very short in length

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C. Because parallel lines suggest the field varies greatly

Why are field lines inside a solenoid described as parallel straight lines?

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