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A line's plan lies wholly on the reference line. The line therefore lies

  • A.in the horizontal plane
  • B.parallel to both principal planes
  • C.perpendicular to the vertical plane
  • D.in the vertical plane

Answer: D

Correct answer: in the vertical plane

If every point of the line has its plan on the reference line then every point is at zero distance in front of the vertical plane, which means the line lies in that plane. Lying in the horizontal plane would put the elevation on the reference line instead, which is the mirror case.

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